[whatwg/dom] Add abort reason to AbortSignal (PR #1027)

Based on the discussion in https://github.com/whatwg/streams/issues/1165, it was suggested that we add an abort reason property to [AbortSignal](https://dom.spec.whatwg.org/#abortsignal). This PR makes the initial changes to the base primitives in the DOM spec, before we make changes to all other related specs that use the AbortSignal.

- [ ] At least two implementers are interested (and none opposed):
   * …
   * …
- [ ] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * …
- [ ] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chrome: ...
   * Firefox: …
   * Safari: …

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

  https://github.com/whatwg/dom/pull/1027


-- Commit Summary --

  * <a href="https://github.com/whatwg/dom/pull/1027/commits/e18e1309e7a47fd391dd01a77009e8f4c1965824">add abort reason to AbortSignal and Controller</a>

-- File Changes --

    M dom.bs (21)

-- Patch Links --

https://github.com/whatwg/dom/pull/1027.patch

https://github.com/whatwg/dom/pull/1027.diff


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