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

Maybe when calling the constructor, you specify a callback for `trailers`, which is invoked after the stream is done, and returns the trailer map at that point:

```
 const response = new Response('I am a body', {
  headers: {
   'Trailer': 'animal'
  },
  trailers: () => { return { animal: animal } }
 });
```

On the receiving end, invoking `response.trailers()` before reading the entire body is an error.

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