[heycam/webidl] Tweak async iterator algorithms (#802)

Make both the "async iterator initialization steps" and the "get the next iteration result" take two arguments: the instance, and the async iterator. This ends up being more ergonomic than using the "current state" concept.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/802

-- Commit Summary --

  * Tweak async iterator algorithms

-- File Changes --

    M index.bs (34)

-- Patch Links --

https://github.com/heycam/webidl/pull/802.patch
https://github.com/heycam/webidl/pull/802.diff

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