[streams] Add missing methods to the ReadableByteStream class definition (#273)

Also align its format with the latest ReadableStream spec.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/273

-- Commit Summary --

  * Add missing methods to the ReadableByteStream class definition

-- File Changes --

    M BinaryExtension.md (23)

-- Patch Links --

https://github.com/whatwg/streams/pull/273.patch
https://github.com/whatwg/streams/pull/273.diff

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https://github.com/whatwg/streams/pull/273