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

> I made a PR (to Node) for adding weak listeners

@benjamingr this is awesome, thank you! I believe this is going to be really useful beyond `AbortController`, too. I used the [weak event pattern](https://docs.microsoft.com/en-us/dotnet/desktop/wpf/advanced/weak-event-patterns?view=netframeworkdesktop-4.8) quite a few times in .NET. 

Once your PR is merged in, what would be best way to detect this feature? I have this [`createWeakEventListener`](https://gist.github.com/noseratio/f037cd08041a72e31e3899747cb85462#file-linkedabortcontroller-mjs-L15) that works in browsers, for Node I'd like to update it to use your implementation where available. 

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