Re: [whatwg/fetch] Fetch termination API "meeting" (#455)

Here's the stuff I'd like to get answers for:

* Are we looking to control/observe the request, or the response too?
* Should the return value of `fetch()` provide means to control/observe the fetch?
* What's the API?

Use-cases to consider:

* Controlling `fetch(url).then(r => r.json())`.
* Controlling multiple parallel fetches.
* Controlling a series of fetches.
* `fetchEvent.respondWith(fetch(fetchEvent.request))` - does this get me anything for free? If the page aborts the fetch, will the service worker request/response be aborted?
* What if a service worker response is made of:
  * An unrelated fetch.
  * Multiple fetches.
  * Cache API match(es).

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