[whatwg/streams] Export "readable stream", "writable stream" and "chunk" (#871)

Add export annotations to the definitions for the concepts "readable
stream", "writable stream" and "chunk" so that they can be used from
other standards.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/871

-- Commit Summary --

  * Export "readable stream", "writable stream" and "chunk"

-- File Changes --

    M index.bs (13)

-- Patch Links --

https://github.com/whatwg/streams/pull/871.patch
https://github.com/whatwg/streams/pull/871.diff

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