[whatwg/dom] Consider adding Promise-based API for listerning event (#333)

We now have `once` option in `AddEventListenerOptions`, but wouldn't it be more convenient if there is a Promise-based API for that?

Probably something like
```text
partial interface EventTarget {
  Promise<Event> on(DOMString type, optional EventListenerOptions options);
}
```
and let it behave like `AddEventListenerOptions.once`?

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