[whatwg/streams] Add an extension point for byte transform streams (#820)

Prohibit non-undefined values of readableType and writableType properties
on the transformer to reserve them for future use defining byte
transforms.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/820

-- Commit Summary --

  * Add an extension point for byte transform streams

-- File Changes --

    M reference-implementation/lib/transform-stream.js (12)
    M reference-implementation/to-upstream-wpts/transform-streams/general.js (8)

-- Patch Links --

https://github.com/whatwg/streams/pull/820.patch
https://github.com/whatwg/streams/pull/820.diff

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