[w3c/ServiceWorker] SW call (#1173)

There are one or two issues that would benefit from a few of us jumping on a call to discuss.

Some topics:

# Multiple instances and scoping

Multiple service worker thread instances for the same scope/version.  AIUI from the last f2f edge needs this for their push notifications integration.  Safari has also indicated they would need it if they implemented.  This change could be breaking given our current model and we should probably discuss if/how to adapt.

# Foreign fetch

While we had previous consensus between Mozilla/Google on this API, I believe we now have some privacy concerns.  In particular, there is a question of how well the feature could work given privacy models like safari's double-keying or new ITP system.  There is some desire to move towards double-keying within Mozilla, so that is partly where our new concern is coming from.

Also:

* Navigation load type https://github.com/w3c/ServiceWorker/issues/1167 - To replace isReload. Minor bikeshedding.
* reservedClientId etc https://github.com/w3c/ServiceWorker/issues/1091 - Reach agreement on the naming.

Anything else? I'll start figuring out times & dates.


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