[whatwg/fetch] Resizable ArrayBuffers and Response and Request objects (Issue #1560)

@domenic @annevk ... Wondering what the expected behavior should be here with the upcoming introduction of resizable ArrayBuffers.

Assuming something like the following:

```
const enc = new TextEncoder();
const ab = new ArrayBuffer(10, { maxByteLength: 20 })
const u8 = new Uint8Array(ab, 0, 10);
const resp = new Response(u8);

// Edit u8 after calling new Response...
enc.encodeInto('hellothere', u8);

// Resize after calling new Response...
ab.resize(8);
```

What *should* be expect the `Content-Length` and payload content to be?

* Option 1: Content-Length == 10, payload `\0000\0000\0000\0000\0000\0000\0000\0000\0000\0000`
* Option 2: Content-Length == 10, payload `hellothe\0000\0000`
* Option 3: Content-Length == 8, payload `hellothe`
* Option 4: Something else?

Should the `u8`/`ab` become detached when passed to `new Response(...)`?

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