[whatwg/streams] Allow aborting an ongoing pipe operation using AbortSignals (#744)

Closes #446.

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Blocked on https://github.com/whatwg/dom/pull/437 finishing up, but it was important to write this up as a proof of concept; it shows that the AbortSignal design is good for our needs.

There's a bit of a namespace collision in how streams has chosen writer.abort() to mean one thing which is a bit different from signal.abort() on a pipe. Maybe we should put a bit more about that in the developer-facing domintro boxes. But I don't think it's avoidable.

/cc @annevk 
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/744

-- Commit Summary --

  * Allow aborting an ongoing pipe operation using AbortSignals

-- File Changes --

    M index.bs (24)

-- Patch Links --

https://github.com/whatwg/streams/pull/744.patch
https://github.com/whatwg/streams/pull/744.diff

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