Re: [whatwg/fetch] Trailer support in the API (#981)

Thoughts:

* Reading trailers: `Promise<Headers> trailers()` makes sense for both `Request` and `Response`. I don't think we should reject if you call it before consuming the body. However, I don't think it should actively consume the body either. That seems very bad. Is it impractical to make them available before the body is consumed? If so, I guess we need to require body consumption before it will start returning something useful. Except perhaps for synthetic requests/responses.
* Setting trailers: `Promise<HeadersInit> trailers;` makes sense for both `Request` and `Response`. I don't think we should reject if you resolve the promise early. `Headers` is not an expensive object to keep around.
* Caching: not sure. Perhaps cached entries never have trailers?

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