Re: [whatwg/dom] once() and on() async utilities for EventTarget (Issue #1038)

Related: [proposal to add Observables and make EventTarget observable](https://github.com/domfarolino/observable).

The `once` case would be `await target.on('event').first()`. The iterator case would require [a new helper](https://github.com/domfarolino/observable/issues/33), and a choice of queuing strategy, but you can imagine something like `for await (item of target.on('event').iterate('unbuffered')) ...`.

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