[whatwg/streams] Align WritableStream structure with ReadableStream structure (#462)

- Add WritableStreamDefaultWriter
- Add WritableStreamDefaultController
- Add lock related methods
- Update reader.pipeTo() to use the new WritableStream classes
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/462

-- Commit Summary --

  * Align WritableStream structure with ReadableStream structure

-- File Changes --

    M reference-implementation/lib/readable-stream.js (17)
    M reference-implementation/lib/transform-stream.js (4)
    M reference-implementation/lib/writable-stream.js (718)
    M reference-implementation/run-tests.js (2)
    M reference-implementation/test/writable-stream-abort.js (103)
    M reference-implementation/test/writable-stream.js (228)

-- Patch Links --

https://github.com/whatwg/streams/pull/462.patch
https://github.com/whatwg/streams/pull/462.diff

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