[whatwg/streams] Treat forAuthorCode as an internal slot of reader object (#984)

This continues @jorendorff's initial work in #969.

Closes #964.

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/984

-- Commit Summary --

  * Treat forAuthorCode as an internal slot of reader object.
  * Add missing exports in reference implementation
  * Update spec text for async iterator
  * Update reference implementation

-- File Changes --

    M index.bs (96)
    M reference-implementation/lib/readable-stream.js (69)

-- Patch Links --

https://github.com/whatwg/streams/pull/984.patch
https://github.com/whatwg/streams/pull/984.diff

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