Re: [whatwg/dom] Consider adding AbortController.prototype.follow(signal) (#920)

> The handler would have to be weak so that if the operation completes successfully the parent controller's signal does not keep a reference to the child controller. This is impossible in userland because `addEventListener`'s API takes a function.

@benjamingr I've been playing with this idea using `WeakRef` and `FinalizationRegistry`, and I think I may have come up with [something that works](https://github.com/nodejs/node/discussions/36467), although it isn't trivial to test.

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