[whatwg/dom] add signal to addEventListener (#919)

An attempt to try and fix https://github.com/whatwg/dom/issues/911 and get more familiar with the spec in the process.

I am happy to contribute WPT for this if that would help.

- [ ] 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/master/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chrome: …
   * Firefox: …
   * Safari: …

(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

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

  https://github.com/whatwg/dom/pull/919


-- Commit Summary --

  * add signal to addEventListener - first attempt

-- File Changes --

    M dom.bs (27)

-- Patch Links --

https://github.com/whatwg/dom/pull/919.patch

https://github.com/whatwg/dom/pull/919.diff


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