[whatwg/streams] Don't mandate transform method in TransformStream (#573)

This was bugging me for ages but I assumed the consensus had already settled on that design.

Closes #565.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/573

-- Commit Summary --

  * Don't mandate transform method in TransformStream

-- File Changes --

    M reference-implementation/lib/transform-stream.js (32)
    M reference-implementation/to-upstream-wpts/transform-stream/general.js (8)

-- Patch Links --

https://github.com/whatwg/streams/pull/573.patch
https://github.com/whatwg/streams/pull/573.diff

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