Re: [streams] rsReader.readBatch(numberOfChunks)? rbsReader.read(view, { waitUntilDone: true })? (#320)

@wanderview given

> So I see this as an "async required" problem and not Promise specific. If we could implement this with just callbacks without hitting set time out clamping I think we would see similar results.

Maybe a good way to cut out the noise here is to actually test callbacks + a loop (i.e., manually emulate the microtask queue) and compare that to sync read. Then we can see if an ideal fast microtask queue/promise implementation still introduces 7 ms of latency, or if it's just a Firefox-on-mobile optimization issue.

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