Re: [streams] Byte streams: write up design rationales and vision for how they are used/what they enable (#177)

I started on this a bit by documenting some recently-discovered constraints [in Requirements.md](https://github.com/whatwg/streams/blob/master/Requirements.md#byte-streams), although it was pretty quick and not too comprehensive.

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https://github.com/whatwg/streams/issues/177#issuecomment-82183493