[WebAPI] Implement AbortSignal.timeout()

[hamishwillee]

Acceptance Criteria

• The listed features are documented sufficiently on MDN
• BCD is updated
• Interactive example and data repos are updated if appropriate
• The content has been reviewed as needed

For folks helping with Firefox related documentation

• Set bugs to dev-doc-complete
• Add entry to Firefox release notes if feature is enabled in release
  or
• Add entry to Firefox experimental features page if feature is not yet enabled in release

Features to document

AbortSignal.timeout

• in spec here: https://dom.spec.whatwg.org/#dom-abortsignal-timeout
• Explainer : Introduce AbortSignal.timeout() whatwg/dom#1032
• Abort signal test: https://wpt.live/dom/abort/abort-signal-timeout.html

Related Gecko bugs

https://bugzilla.mozilla.org/show_bug.cgi?id=1753309

Other

[hamishwillee]

Status:

• BCD: FF100 AbortSignal.timeout() supported browser-compat-data#15644
• Docs FF100 Add AbortSignal.timeout() static method #14886
• Release note - FF100 Add AbortSignal.timeout() static method #14886
• dev-docs-complete

[hamishwillee]

@Rumyra I think this one is good now.