[slightlyoff/ServiceWorker] Foreign fetch and no-referrer Referrer Policy (#899)

Currently the way foreign fetch is specified, a foreign fetch handler always has access to the requests origin. When a requests referrer policy is `no-referrer` this should probably not be allowed though. Not sure what the best thing to do here would be though:

1. Change `ForeignFetchEvent.origin` to return `"null"` if the referrer policy is `no-referrer`. Which would effectively mean foreign fetch could only reply with opaque responses to these requests (which again means it can only reply to no-cors requests). Or maybe just
2. Don't allow foreign fetch to intercept no-referrer requests at all.

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https://github.com/slightlyoff/ServiceWorker/issues/899