[heycam/webidl] Introduce the observable array type (#836)

Part of #796.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/836

-- Commit Summary --

  * Introduce the observable array type

-- File Changes --

    M index.bs (299)

-- Patch Links --

https://github.com/heycam/webidl/pull/836.patch
https://github.com/heycam/webidl/pull/836.diff

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