[whatwg/fetch] Resource fetches for notifications shown from a service worker should trigger onfetch (#303)

Currently it is not clear whether resource fetches for notifications (e.g. icons) shown from a service worker should trigger the service worker onfetch handler. As a use case it makes sense to enable offlining these resources.

My understanding is that fetches initiated directly from a service worker are not passed through the service worker onfetch handler, which seems reasonable. However, what about the fetches triggered indirectly by actions initiated in the service worker, like showing a notification?

CC @annevk @jakearchibald @beverloo @slightlyoff

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