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

Re: API - I think the simplest API would probably be a constructor argument:

```js
const childController = new AbortController(parentSignal); // creates a linked AbortController
```

 I'd love to see a use case where adding the reference to the child controller at construction doesn't work.

Re: weak event listeners and WeakRefs - I want to agree and echo there is no way to not "leak the thunk" - I get Node servers are not really a priority for WHATWG but I assume people with long running PWAs can likely run into this issue even if they implement the WeakRef solution you propose in userland (note you also need to keep a strong reference from the child to the parent in that case). Weak event listeners would address this as well though they feel like a much more powerful tool.

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