[whatwg/dom] AsyncContext proposal integration (PR #1521)

This patch includes the three changes needed in DOM to work with AsyncContext and https://github.com/whatwg/html/pull/13063:
- support to pass a context to the "fire an event" logic
- the `[PropagatesAsyncContextToEvents]` WebIDL extended attribute
- propagation for `AbortSignal.timeout()`, which needs to propagate its context to the `abort` event

I originally thought that we'd also need to handle the custom elements logic that is here in DOM (e.g. as part of the `move`) steps, but the changes in HTML are enough also for the algorithms defined in DOM.

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

  https://github.com/whatwg/dom/pull/1521

-- Commit Summary --

  * Allow passing an Async Context Mapping to "fire an event"
  * Add the [PropagatesAsyncContextToEvents] extended attribute
  * Propagate AsyncContext from AbortSignal.timeout() to its abort event

-- File Changes --

    M dom.bs (156)

-- Patch Links --

https://github.com/whatwg/dom/pull/1521.patch
https://github.com/whatwg/dom/pull/1521.diff

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