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

@alancutter wrote:
> We should also spec a serialisation format for app IDs so sites can refer to each other.

Or alternatively, if the manifest URL is used as the stable identifier for a web application, there's no need to invent a new [ID serialisation format](https://url.spec.whatwg.org/#url-serializing) which can be used to [link](https://tools.ietf.org/html/rfc8288) to other web apps.

Having the identifier resolve to the manifest could also have added benefits in use cases like the [pwa-url-handler](https://github.com/WICG/pwa-url-handler) one linked above, because its metadata could directly be used to generate UI elements representing the handling apps (e.g. using the app title and icon in a permission prompt).

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