Re: [whatwg/streams] ReadableStream should be an async iterable (#778)

Wrapper object seems like a clear winner.

I didn't like the sound of auto-cancel, but given @domenic's code example it sounds like the better thing to do.

We could have:

```js
for await (const chunk of stream.iterator({ preventClose: true })) {
  // …
}
```

Then `stream[Symbol.asyncIterator]` could alias `stream.iterator`.

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