[streams] Merge ReadableByteStream into ReadableStream (#430)

This commit includes the following design changes:

- sync the spec text with the new reference implementation
- #423
  - add byobRequest getter to the controller
- port the asserts in the non-byte source version to the byte source version
- remove auto release feature from the byte source version
- rename Byob to BYOB
- move TransferArrayBuffer to helpers.js
- make the default highWaterMark of the byte source version to 0
- port the functionality that the start method can delay pulling by returning a pending Promise to the byte source version
- add `[[disturbed]]` feature to the byte source version
- port highWaterMark mechanism to ReadableByteStreamController
- merge ReadableStream and ReadableByteStream
  - now it behaves differently based on whether the given source has pullInto or not
  - bunch of renaming for merge
- merge ReadableStreamReader and ReadableByteStreamReader
- #424
  - make controller.close() and controller.enqueue() fail when the stream is not in the readable state
  - make controller.enqueue() throw a predefined TypeError, not the stored error
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/430

-- Commit Summary --

  * Merge ReadableByteStream into ReadableStream

-- File Changes --

    M reference-implementation/lib/helpers.js (24)
    M reference-implementation/lib/queue-with-sizes.js (3)
    M reference-implementation/lib/readable-stream.js (1554)
    M reference-implementation/run-tests.js (2)
    M reference-implementation/test/pipe-to-options.js (68)
    M reference-implementation/test/readable-byte-stream.js (1294)
    M reference-implementation/test/readable-stream-templated.js (38)
    M reference-implementation/web-platform-tests/readable-streams/bad-underlying-sources.js (18)
    M reference-implementation/web-platform-tests/readable-streams/cancel.js (1)
    M reference-implementation/web-platform-tests/readable-streams/general.js (52)

-- Patch Links --

https://github.com/whatwg/streams/pull/430.patch
https://github.com/whatwg/streams/pull/430.diff

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https://github.com/whatwg/streams/pull/430