Re: [fetch] Feed a Response to existing APIs (#49)

There is an additional paradigm where you pipe the response body stream to a writable stream. I am not 100% sure on how this would all work but you could imagine e.g.

```js
const ws = new StreamingImageDecoder();
responseInstance.body.pipeTo(ws).then(() => {
  // use ws.something... maybe ws.bitmap returns an ImageBitmap?
  // ws.element returns a HTMLImageElement?
});
```

In this scenario you could probably access `ws.something` before the pipe finishes to see the in-progress image. (Remember the 90s where you could see images stream visually over slow connections?)

Another version (possibly more useful for continually-updating things) is

```js
responseInstance.body.pipeTo(videoEl.writable);
```

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