[slightlyoff/ServiceWorker] CORS pre-flight for foreign fetch (#880)

At the F2F the point was brought up if foreign fetch should involve some kind of pre-flight like regular cross origin CORS requests has. This could take the form of extending the `ForeignFetchOptions` dictionary to have additional fields to limit which requests can get intercepted by the foreign fetch service worker, such as allowed methods and headers.


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https://github.com/slightlyoff/ServiceWorker/issues/880