Re: [streams] Support reading bytes into buffers allocated by user code on platforms where only async read is available (#253)

@domenic If you absolutely have to return an output view for each view that was put in, could you just return an empty view with `done: false` for each input view, and then a final iteration with `done: true` and `value: undefined`?  It's a bit of a corner case, anyway (I think).

Request queueing is sometimes useful in async iterators.  For example, you want to send a bunch of things to a sink and then just await the final write, or if you want to send a "return" signal (to close the iterator) regardless of whether there is an in-flight "next" request.

Also, if you reject when there's an in-flight request, then you open up some non-deterministic failure patterns.



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