[w3c/push-api] Expose pushManager on Window (PR #393)

This is part of the Declarative Web Push initiative (see #360) and mainly makes sense when that is supported, although could be independently supported in theory.

This makes window.pushManager work by making push subscriptions tied to a scope rather than a service worker registration. Most often push subscriptions remain 1:1 with service worker registrations, but the scope whose serialized path is "/" is treated specially from now on and can exist independently.

This obsoletes #368.

The following tasks have been completed:

 * [ ] Modified Web platform tests (link to pull request)

Implementer support:
 
 * [ ] Chromium 
 * [ ] Gecko
 * [x] WebKit


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<a href="https://pr-preview.s3.amazonaws.com/w3c/push-api/pull/393.html" title="Last updated on Nov 19, 2024, 12:28 PM UTC (6e463a7)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/push-api/393/53fc465...6e463a7.html" title="Last updated on Nov 19, 2024, 12:28 PM UTC (6e463a7)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/push-api/pull/393

-- Commit Summary --

  * Expose pushManager on Window
  * Update index.html

-- File Changes --

    M index.html (310)

-- Patch Links --

https://github.com/w3c/push-api/pull/393.patch
https://github.com/w3c/push-api/pull/393.diff

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