[whatwg/fetch] Should `body` be set up as a byte stream? (Issue #1572)

Currently this succeeds on Firefox and fails on Chrome:

```js
new Response(new Uint8Array([1,2])).body.getReader({mode: 'byob'})
```

Firefox creates body as a body stream: https://searchfox.org/mozilla-central/rev/43cb6eca1c3069d46d589d52ab4949257e630d19/dom/streams/ReadableStream.cpp#871

But the spec does not actually use "[set up with byte reading support](https://streams.spec.whatwg.org/#readablestream-set-up-with-byte-reading-support)" algorithm, and I see no relevant test for this.

I think it should support byte stream as fetch is all about bytes. What do you think?

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