Re: [whatwg/streams] Make read requests abortable (#1103)

The desired behavior seems analogous to the `preventCancel` and `preventAbort` options to `pipeTo()` and `pipeThrough()`.

IIRC calling `reader.cancel()` will cause `promise2` to resolve with `done` set to `true`. Using the `AbortSignal` should probably cause it to reject with an `"AbortError"` `DOMException` instead since the stream isn't really "done".

If we added an `AbortSignal` parameter to `pull()` then it would make sense to signal it in this case, but only if there were no other reads queued.

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