[whatwg/streams] brand-check transformstream methods (#542)

Based on the ReadableStream brand-checking.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/542

-- Commit Summary --

  * brandcheck transformstream controller methods
  * brandcheck transformstream getters
  * brandcheck transformstream controller constructor

-- File Changes --

    M reference-implementation/lib/transform-stream.js (82)

-- Patch Links --

https://github.com/whatwg/streams/pull/542.patch
https://github.com/whatwg/streams/pull/542.diff

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