Re: [whatwg/fetch] Allow request take AsyncIterable body? (#1291)

[Bun also supports this non-standard behavior.](https://bun.sh/guides/http/stream-iterator)

Also, when I have an `AsyncIterable<Uint8Array>` and want to convert it into an `ArrayBuffer`, GitHub Copilot actually suggested this code:

```js
const stream = generateZipStream()
const buffer = await new Response(stream).arrayBuffer()
```

Admittedly the above code looks a bit cursed, but given that `Array.fromAsync` wasn't an option back then (and still isn't in Node LTS today, i.e. v20), the above code was a one-liner that works in Node.js (all the way back to v18) and in Bun, and popular enough to be suggested by AI models as a viable solution. With its convenience, I kinda hope it becomes a de-facto standard.

By the way, I later discovered that as of now, **the above code does not work in Deno and in browsers.** So I had to change it to this, but then compatibility with Node 20 is broken:

```js
const stream = generateZipStream()
const buffer = await new Blob(await Array.fromAsync(stream)).arrayBuffer()
```

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