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

I'd ideally like to generalize this to ReadableStream as well, using the size() measuring functionality from the queuing strategy. In which case it needs a better name. consumedSize? consumed? readCount? readSize? offset? (I think I like offset the most.)

Also, I would really appreciate if anyone else has scenarios where this property is useful, besides HTTP streams and Content-Length. I guess in general it can be useful for progress meter type things. What else?

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