Re: [w3c/manifest] Add a unique identifier for a PWA (#586)

It seems like the main sticking point here is the 4th scenario - changing the manifest url. We know many sites do this, and crawling the data from https://pwa-directory.appspot.com shows us about 8.4% of manifests seem to have versions. Even with false positives, and that directory not being authoritative, that's a really high percentage, and a higher percentage than 2018:
https://github.com/w3c/manifest/issues/586#issuecomment-386820382.

If chromium never supported a changing manifest url, then this scenario wouldn't be as important, but unfortunately it was supported and thus people now rely on it. Seems to be the story of the web platform, for better or worse :/


Command:
```
curl -sSL 'https://pwa-directory.appspot.com/api/pwa/?limit=4000' | jq -r '.[] | .manifestUrl' | sort | perl -ne 'print if /[0-9a-fA-F]{7}/ || /v[0-9]+/ || /v=/'
```

Total PWAs & percentage:
```
last valid page: https://pwa-directory.appspot.com/?page=130
130 * 32 = 4160 total

353 PWAs in the below list
353 / 4160 = ~8.4%
```

<details>
  <summary>Details</summary>

```
http://res.cloudinary.com/dyyjph6kx/raw/upload/v1502969304/webui/eng/icons/manifest.json
https://13tv.co.il/wp-content/themes/reshet_tv/assets/images/favicon/manifest.json?v=1.3.12.0
https://15f7fy16numklnwbn3m52e15-wpengine.netdna-ssl.com/wp-content/plugins/onesignal-free-web-push-notifications/sdk_files/manifest.json.php?gcm_sender_id=303798283697
https://3235253.ucoz.ru/appmanifest/manifest.json
https://3235253.ucoz.ru/manifest.json
https://3235253.ucoz.ru/manifest_u.json
https://3235253.ucoz.ru/manifest_v.json
https://3235253.ucoz.ru/rss/manifest.json
https://7352323.ucoz.ru/7manifest.json
https://7352323.ucoz.ru/manif9est.json
https://7352323.ucoz.ru/manifest.json
https://ae.almosafer.com/mweb/manifest_almosafer.json?1539868957
https://agen.bukalapak.com/_nuxt/manifest.387a3d55.json
https://alleideen.com/manifest.0d8eb347138956bc50bca91b31fb6204.json
https://app.milanote.com/manifest-20201221.json
https://app.truewealth.ch/assets/favicons-d5c20aa/manifest.json
https://app.uplancer.io/_nuxt/manifest.dacc6f01.json
https://aqi.breezo.in/manifest.json?v=0.2
https://arquivosapk.com/wp-json/pwa-for-wp/v2/pwa-manifest-json
https://assets.slideslive.com/assets/favicon/manifest-1145378c0ec8e607c095f2fe43a6a16e7c22f86161165c502d836eebe2452832.json?v=vMr5gnj6OR
https://assets.vita4you.gr/static/version1575339893/frontend/Fixit-mobile/vita4you/el_GR/manifest.json
https://assets.vodspy.de/img/favicons/manifest.json?v=rM3LLEeJYB
https://atmocast.com/static/weather_main/www/static/weather_main/dist/manifest/manifest.eea759a01fcb.json
https://auskunft.avv.de/manifest.json?v=2.3.4
https://auth.magicleap.com/manifest.json?v=20171020
https://b2v8w6eq1p1erh.cdn.jp.idcfcloud.com/sp/top/json/manifest.json
https://badoo.com/badoo/manifest-en.json?v101
https://bael-theme.jake101.com/_nuxt/manifest.a2e69f0a.json
https://banca.oimparcial.com.br/app/themes/banca/assets/imgs/icons/manifest.json?v=518
https://bber.unm.cool/_nuxt/manifest.6ac3b74e.json
https://bitsofco.de/assets/manifest.json?v=25a0d663d4
https://bitsofco.de/assets/manifest.json?v=aa20601b17
https://brex.com/icons-e860f2dd2739fb15edb772012ada22b9/manifest.json
https://buddy.works/manifest.json?v=800
https://burdie.co/wp-json/app/v1/pwp-manifest
https://catalogue.accasoftware.com/mn-catalogo-en.json?v=110
https://cdn.framebridge.com/assets/favicons/manifest-33209ed395f245282c3a56d5cad485e1.json?v=BGBGy60NMJ
https://cdn.launchforth.io/7bf59d7/images/forth/favicons/manifest.json?v=OmyQRN88Nf
https://cdn.quiqup.com/webapp/qa/2.27.2/develop/f315cdaa3883ac2a24a2fb7ca2f8cec33c7d1d74/manifest.5c43e6283efbdbaa8fd7d567201c273b.json
https://cdn.shopify.com/s/files/1/0086/4865/4895/t/2/assets/site.webmanifest?v=10225873222616858641
https://cdn.shopify.com/s/files/1/0196/9616/t/72/assets/manifest.json?8865377658911702158
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https://cdn.shopify.com/s/files/1/1346/5473/t/60/assets/manifest.json?9199080155338096461
https://cdn.shopify.com/s/files/1/1366/8315/t/7/assets/manifest.json?8987383188635618396
https://cdn.shopify.com/s/files/1/1425/6082/t/97/assets/manifest.json?6342006907692054657
https://cdn.shopify.com/s/files/1/1751/8993/t/60/assets/manifest.json?3304484036080071639
https://cdn.shopify.com/s/files/1/2546/6304/t/3/assets/manifest.json?13114392473843896000
https://cdn.shopify.com/s/files/1/2964/9158/t/27/assets/manifest.json?14159899360358630437
https://celebrities.pictures/wp-json/wp/v2/web-app-manifest
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https://club.tarifhaus.de/manifest.json?v=v1.17.0
https://competitiondigest.com/wp-content/plugins/onesignal-free-web-push-notifications/sdk_files/manifest.json.php?gcm_sender_id=467456738029
https://connery.dk/graphics/manifest.json?version=1532614009
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https://d30hza86imyv6n.cloudfront.net/statics/js/fcm/manifest.json?v=20180717122826
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https://deliverydudes.com/manifest.json?v=3.4.2-fbbd0343066d0de6d6899ebfdc26a8a2e6bcc035-desktop
https://deliverydudes.com/manifest.json?v=3.4.3-22b7c67ac3ede49412caab9ba33a59f88fa6929b-desktop
https://demo.scandipwa.com/static/version1573566737020/frontend/Scandiweb/pwa/en_US/Magento_Theme/manifest.a848d42b8c744af528977d4408ceb768.json
https://designwebkit.com/manifest.json?v1
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https://earningkart.in/wp-content/plugins/onesignal-free-web-push-notifications/sdk_files/manifest.json.php?gcm_sender_id=511885697223
https://ecourse.el-css.edu.om/manifest.8d9136a424a4e9fe28c4540e560b2eb4.json
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https://ehazi.hu/manifest.json?v=2
https://emojibombs.com/manifest.a73d7e65.webmanifest
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https://ethiopian-calendar.netlify.com/assets/icons-b23883c8/manifest.json
https://eurekamag.com/favicons/manifest.json?v=rM3ed7neBK
https://face2faceafrica.com/wp-content/themes/f2fa-v3/manifest.json
https://facerepo.com/app/images/favicons/manifest.json?v=8190
https://farlofacile.com/s/tmpl/on/manifest/manifest.json?v=dLBXnGO3e6
https://findpizza.space/_nuxt/manifest.99f3e3ec.json
https://fotobiz.pro/wp-content/plugins/onesignal-free-web-push-notifications/sdk_files/manifest.json.php?gcm_sender_id=151586796557
https://gazeta-licey.ru/wp-content/plugins/onesignal-free-web-push-notifications/sdk_files/manifest.json.php?gcm_sender_id=338097788326
https://geekpublicitario.com.br/wp-content/plugins/onesignal-free-web-push-notifications/sdk_files/manifest.json.php?gcm_sender_id=45077066116
https://generative.fm/c58bca5e9803118f86e9c9afcf9bdb1f.webmanifest
https://gruzovichkof.ru/site.webmanifest?v=69BqJv4KQN
https://hackr.io/manifest.json?v=1.1
https://hardwaresfera.com/wp-json/pwa-for-wp/v2/pwa-manifest-json
https://health.cloudtcm.com/_nuxt/manifest.cb7a46f8.json
https://hindi.indiansutras.com/browser.json?v=1.0.2
https://horacekeung.github.io/scrum-poker/_nuxt/manifest.3fb4b0a0.json
https://huren.flixbus.nl/manifest.json?dcea861a57
https://hydrobuilder.com/skin/frontend/rwd/hydrobuilder/manifest.json?v=NmP8E8oJLa
https://infohookah.ru/wp-json/app/v1/pwp-manifest
https://intriper.com/wp-content/plugins/onesignal-free-web-push-notifications/sdk_files/manifest.json.php?gcm_sender_id=10954234324
https://invidio.us/site.webmanifest?v=a3045a3
https://is-nb.a8e.net.br/images/mobile/favicon/manifest.json?v=92aaaa
https://jcl.cz/favicons/manifest.json?v=8j6XJMAvAp
https://job-draft.jp/assets/favicon/manifest-5e26f226e3746a244b9991698dd9f76d0d2a8498f2f0e221ad4bffb2aeeb067e.json
https://journalisticapp.com/_nuxt/manifest.452c72d4.json
https://jovemaprendizbr.com.br/wp-content/plugins/onesignal-free-web-push-notifications/sdk_files/manifest.json.php?gcm_sender_id=878054065872
https://kannada.indiansutras.com/browser.json?v=1.0.2
https://lavito.pl/images/favicon/manifest.json?v=20160928100049
https://leifheit.de/manifest.5cdb6c2deddae2a7fde58d6f1d9ed298.json
https://lifeacademy.ru/Media/favicons/manifest.json
https://liveindex.org/wp-content/plugins/onesignal-free-web-push-notifications/sdk_files/manifest.json.php?gcm_sender_id=247458917002
https://livetoday.online/wp-content/plugins/onesignal-free-web-push-notifications/sdk_files/manifest.json.php?gcm_sender_id=46304322746
https://liwli.ru/s/i/manifest.json?v=5A5ydyp6Jy
https://lowerspendings.com/_nuxt/manifest.070d2d8c.json
https://lunarworks.co.uk/site.webmanifest?v=XBzAaWkGGw
https://m-loi-pinel.trouver-un-logement-neuf.com/manifest.json?v=8jeqgYk97l
https://m.ithome.com/json/manifest.json?v=20190214
https://m.ithome.com/json/manifest.json?v=2019042801
https://m.livingathome.de/r1531314069712/manifest.json
https://m.met.hu/site.webmanifest?v=2bBRvozOrO
https://m.visitjeju.net/_nuxt/manifest.b93ff49c.json
https://malayalam.indiansutras.com/browser.json?v=1.0.2
https://market24hclock.com/manifest.json?v=2016.01
https://matexperience.com/site.webmanifest?v=694olv6vGq
https://meapaixonei.com.br/wp-content/plugins/onesignal-free-web-push-notifications/sdk_files/manifest.json.php?gcm_sender_id=766161200110
https://melaku.ml/assets/icons-b23883c8/manifest.json
https://mmm.dk/graphics/manifest.json?version=1532529712
https://mobile.48365365.com/WebAppManifestV2.json
https://msk.gruzovichkof.ru/site.webmanifest?v=69BqJv4KQN
https://mundomulheres.com/wp-content/plugins/onesignal-free-web-push-notifications/sdk_files/manifest.json.php?gcm_sender_id=703126565085
https://net4game.com/manifest.json?v=3
https://new.reddit.guide/_nuxt/manifest.3fd2d7ad.json
https://nico.news/_nuxt/manifest.e3e59dbe.json
https://nocorruption.in/wp-content/plugins/onesignal-free-web-push-notifications/sdk_files/manifest.json.php?gcm_sender_id=548458404239
https://number-place-puzzle.net/manifest.json?20180620
https://numerics.info/_nuxt/manifest.5c7e420c.json
https://oimparcial.com.br/app/themes/impar/assets/imgs/icons/manifest.json?v=3
https://optinium-apps.co.uk/Assets/Icons/site.webmanifest?v=PYePN5lxOa
https://parismatch.be/app/themes/parismatch-v1/assets/images/favicons/manifest.json
https://prod-static.disney-plus.net/builds/a823eb64c7e453be430322b0d8a71a8e4ae624e3_1579906393987/images/favicons/manifest.json
https://psd.download.land/wp-content/plugins/onesignal-free-web-push-notifications/sdk_files/manifest.json.php?gcm_sender_id=1040297877182
https://push.nextincareer.com/app/v3/manifest.json.php?gcm_sender_id=
https://pymex.com/wp-content/plugins/onesignal-free-web-push-notifications/sdk_files/manifest.json.php?gcm_sender_id=34581308698
https://r34.app/_nuxt/manifest.02b4b57d.json
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https://radio.codemonkey-spb.ru/res/js/manifest.json?1ea25136
https://rainu.github.io/dev-notes/_nuxt/manifest.1a0b3aa1.json
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https://resource.wakelet.com/v2/4.4.3/manifest.json
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https://s1.hdslb.com/bfs/static/jinkela/mstation-h5/manifest.01d8c0c950f8b24714dd3e8afc8d88f8de18494b.json
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https://sayhello.ch/wp-json/app/v1/pwp-manifest
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https://sizeer.cz/common/images/favicon/manifest.json?v=
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https://smartelement.netsons.org/index.php?rest_route=/wp/v2/web-app-manifest
https://socialcdn.i-say.com/assets/data/manifest.json?t=1532528798881
https://startsat60.com/app/themes/startsat60v7/favicons/manifest.webmanifest
https://static-cache.md.uaprom.net/image/portal/icons/manifest_prom.json?r=31b0755eb4f7b6cae4042261a24a38ce
https://static.glampinghub.com/img/pets-manifest.95617630.json
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https://studitemps.de/wp-content/themes/limitless/manifest.json?v=2
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https://www.buddy.works/manifest.json?v=800
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https://www.bustimes.org.uk/static/manifest.7111e27983b6.webmanifest
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https://www.codecourse.com/_nuxt/manifest.bf25d7b2.json
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https://www.concealednation.org/manifest.json?v=2bb3QegpEf
https://www.connery.dk/graphics/manifest.json?version=1532614013
https://www.connexion-emploi.com/manifest.json?1532617102
https://www.croydonadvertiser.co.uk/manifest.json?v=9bb6f5c11e7bb1905bc12840740df6f2
https://www.culinar.ro/assets/push/manifest.json?t=1532532470
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https://www.cybrhome.com/favicons/manifest.json?20180702184436
https://www.dahaboo.com/manifest.json?v=20180709
https://www.dbushell.com/manifest.webmanifest?v=10.2.0
https://www.debaser.it/manifest.json?v=3
https://www.designwebkit.com/manifest.json?v1
https://www.diana.bg/wp-content/plugins/onesignal-free-web-push-notifications/sdk_files/manifest.json.php?gcm_sender_id=392133639149
https://www.dubaijobs77.com/manifest.json?sndid=103953800507
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https://www.finevent.top/_nuxt/manifest.3023ac05.json
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https://www.foodservicedirect.com/static/version1540372735/frontend/BrewInteractive/FsdTheme/en_US/assets/images/favicon.ico/manifest.json
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