[w3c/ServiceWorker] Editorial: serialize CacheStorage access on a dedicated parallel queue (PR #1838)

Updates to [cache-storage-match](https://w3c.github.io/ServiceWorker/#dom-cachestorage-match), [cache-storage-has](https://w3c.github.io/ServiceWorker/#dom-cachestorage-has), [cache-storage-open](https://w3c.github.io/ServiceWorker/#dom-cachestorage-open), [cache-storage-delete](https://w3c.github.io/ServiceWorker/#dom-cachestorage-delete), and [cache-storage-keys](https://w3c.github.io/ServiceWorker/#dom-cachestorage-keys).

Two issues addressed:
1. **Data race on the shared name-to-cache map.** Multiple `CacheStorage` objects across documents/workers share the same underlying map, so ad-hoc "in parallel" blocks that iterate and mutate the map could race. Introduce a dedicated `name to cache map parallel queue` on the map and route all five methods through it so reads and writes are serialized.
2. **Promise resolution from parallel context.** Each method resolved/rejected its promise directly from the parallel block. Wrap the resolves/rejects in a `Queue a task` on the promise's responsible event loop.

This is part 6/6 of #1740. Also closes #1831 (duplicate). 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/1838

-- Commit Summary --

  * Editorial: serialize CacheStorage access on the name to cache map's parallel queue

-- File Changes --

    M index.bs (42)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1838.patch
https://github.com/w3c/ServiceWorker/pull/1838.diff

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