[whatwg/fetch] FetchObserver (for a single fetch) (#607)

In https://github.com/whatwg/fetch/issues/447#issuecomment-281731850 @jakearchibald sketched some APIs based on @stuartpb's work which @bakulf then implemented:

* https://developer.mozilla.org/en-US/docs/Web/API/FetchObserver
* https://dxr.mozilla.org/mozilla-central/source/dom/webidl/FetchObserver.webidl
* https://dxr.mozilla.org/mozilla-central/source/dom/webidl/Request.webidl#59

That issue got closed after we landed a subset of that API in Fetch (you can finally abort a fetch). Let's discuss the remainder here (though not priorities, that's #436).

cc @wanderview 

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