[w3c/IndexedDB] Add missing parallel step and define queue a database task (PR #456)

Closes https://github.com/w3c/IndexedDB/issues/421

The following tasks have been completed:

 * [ ] Confirmed there are no ReSpec/BikeShed errors or warnings.
 * [ ] Modified Web platform tests (link to pull request)

Implementation commitment:

 * [ ] WebKit (https://bugs.webkit.org/show_bug.cgi?id=)
 * [ ] Chromium (https://bugs.chromium.org/p/chromium/issues/detail?id=)
 * [ ] Gecko (https://bugzilla.mozilla.org/show_bug.cgi?id=)


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

  https://github.com/w3c/IndexedDB/pull/456

-- Commit Summary --

  * add and use `queue a database task` concept
  * Queue a database task for resolving promise in databases()

-- File Changes --

    M index.bs (58)

-- Patch Links --

https://github.com/w3c/IndexedDB/pull/456.patch
https://github.com/w3c/IndexedDB/pull/456.diff

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