Re: [w3c/webpayments] Finer points of integration with Web App Manifest (#225)

Suggest re-using 'integrity' attribute from https://www.w3.org/TR/SRI/

```json
"related_applications": [
    {
      "platform": "play",
      "url": "https://play.google.com/store/apps/details?id=com.bobpay",
      "integrity": "sha384-Li9vy3DqF8tnTXuiaAJuML3ky+er10rcgNR/VqsVpcw+ThHmYcwiB1pbOxEbzJr7",
      "min_version": "1",
      "id": "com.example.app1"
    }, {
      "platform": "itunes",
      "url": "https://itunes.apple.com/app/example-app1/id123456789"
    }
  ]
```

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