[whatwg/dom] Ability to wait for async abort algorithms? (Issue #1389)

saschanaz created an issue (whatwg/dom#1389)

### What is the issue with the DOM Standard?

Currently it's not straightforward to track whether all abort algorithms are finished. You would call `AbortController.abort` and then would hope it that things are aborted, before starting anything new. It's okay to do so when the new job never clashes with the previous supposed-to-be-aborted job (like some simple `fetch()` calls), but might clash if the abort algorithm includes closing a file handle, etc.

Would be nice if abort event had something like `ExtendableEvent.waitUntil`.

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