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

Spitballing follows. Not sure if maybe some of these are already unavailable due to collision given how many EventTarget subclasses there are.

Single

- `.when("blur")`
- `.advent("hashchange")` 
- `.eventual("keydown")` / `.eventually("keydown")`

Iterator

- `.events("message")`
- `.ongoing("input")`
- `.subscribe("submit")`

None of the single-promise ones seem quite right: _when_ doesn’t strongly imply “once,” _eventually_ maybe sounds more like you’re asking the agent to schedule work, and _advent,_ though nearly an exact match for the concept in other regards (even being from the same root word as event), too strongly implies _the_ start of something (i.e., the very first event, not the next event). Still, maybe one of them will kick off better ideas.

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(for a second I thought “oh! ‘await’!” before realizing why that’s a terrible method name — though at least no one could knock `await video.await("waiting")` for being unclear about its intention).

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