Re: [w3c/manifest] Way to detect if a web app is installed (Issue #1092)

dmurph left a comment (w3c/manifest#1092)

I propose we split this issue into two:
1) **in-app install detection** Way for a 'browser context with manifest applied' to know if it is installed (e.g. if the web contents is _in_ the app is installed)
2) **in-browser-tab install detection** Way for a 'browser context without manifest applied' but in-scope of installed web app to know if that web app is installed (e.g. site in browser tab that is is-scope of PWA A, can know if PWA A is installed. )

The 2) functionality is solved in Chromium via the getInstalledRelatedApps() API [spec here](https://wicg.github.io/get-installed-related-apps/spec/#dom-navigator-getinstalledrelatedapps).

Personally I don't think that `installed: yes` should evaluate in a browser tab, as this is more about the UX.

@christianliebel concurs in manifest spec meeting, splitting now.

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