[w3c/manifest] Installation detection from a web app url opened in a browser tab (Issue #1214)

dmurph created an issue (w3c/manifest#1214)

Standardize a way for a web app loaded in a browser tab (e.g. site.com/app) to detect if it has been installed by the user as an app.

This likely would pull over the existing WICG [spec](https://wicg.github.io/get-installed-related-apps/spec/) for getInstalledRelatedApps(), which includes a bunch of protections as well as features to know if a site's native app is installed or not.

If this is something that is supported by enough vendors, then it should be in the spec. If not, we should remove it from the CR list.


This is a fork from the discussion in issue #1092 .

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