Re: [streams] Add `.bytesRead` to ReadableByteStream.*Reader (#367)

This proposal satisfies (1) (detecting partial consumption), (2), (3) (visible only to one who has lock), (4) (as long as the user-authored RBS conforms to the spec) of https://github.com/yutakahirano/fetch-with-streams/issues/37#issuecomment-107836439.

Domenic said ok to give up on (6) at https://github.com/yutakahirano/fetch-with-streams/issues/37#issuecomment-110945488.

(5) and (7) are not satisfied. They can be satisfied only when a wrapper is used.

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