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

I'm definitely still very interested in moving things forward here. The approach outlined in the first half of https://docs.google.com/document/d/1P4MskkFd3HHFPGDr01O3wdFXukmX9i0jAb5uh9v9x8Q/edit#heading=h.tst1r01yr7a appears to make the most sense at the moment.

For sending trailers, being able to specify a `trailers` option with a  `Promise<HeadersInit>` value... e.g.

```js
async function getTrailers() {
  // await stuff
  return new Headers([['a','b']]);
}

const req = new Request('https://example.org', { /** ... **/, trailers: getTrailers());

// likewise for `Response`
```

For receiving trailers, something like...

```
await request.trailers;
await response.trailers;
```

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