Intent to ship: CookieStore API

[Andrea Marchesini]

As of Firefox 136, I intend to turn the CookieStore API on by default on all platforms. It has been developed behind the `dom.cookieStore.enabled` preference.

As discussed previously, we plan to ship an implementation that diverges from the official spec by the following points:

1. `CookieListItem` objects returned via the `CookieStore.get()`/`getAll()` methods only expose the name and value fields. This matches the current functionality of document.cookie.

2. We don't implement the `CookieStoreManager` and the `ServiceWorkerGlobalScope.oncookiechange` event handler, with its `ExtendableCookieChangeEvent` event because we don't want to spawn ServiceWorkers at any cookie change

Status in other browsers:
- Chrome: released since 2020
- Safari is actively working on releasing the same subset described above.

Bug to turn on by default: https://bugzilla.mozilla.org/show_bug.cgi?id=1937477
Standard: https://wicg.github.io/cookie-store/

This feature was previously discussed here: https://github.com/mozilla/standards-positions/issues/94

[Valentin Gosu]

Thank you for all the great work you've put into shipping this, Andrea!

And many thanks to QA who went through a list of top sites known to use the CookieStore API and checked that it didn't cause any issues.

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