[w3c/ServiceWorker] Editorial: queue a task in Client / Clients API (PR #1836)

Updates to:
- [client-postmessage-options](https://w3c.github.io/ServiceWorker/#dom-client-postmessage) — queue tasks to fire `messageerror` and dispatch `message` on the target client's responsible event loop.
- [clients-get](https://w3c.github.io/ServiceWorker/#dom-clients-get) — restructured per @yoshisatoyanagisawa's suggestion to queue once and run "invoke Resolve Get Client Promise" + "abort" as substeps; also queues the fall-through resolve.
- [clients-claim](https://w3c.github.io/ServiceWorker/#dom-clients-claim) — queue the final resolve with undefined on the promise's responsible event loop.

All of these resolved/rejected promises or fired events directly from an "in parallel" block, which violates the "don't touch JS objects from parallel" rule.

This is part 4/6 of #1740. Split out from #1755 for focused review.


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

  https://github.com/w3c/ServiceWorker/pull/1836

-- Commit Summary --

  * Editorial: queue a task to resolve promise or fire event in Client/Clients API

-- File Changes --

    M index.bs (12)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1836.patch
https://github.com/w3c/ServiceWorker/pull/1836.diff

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