Re: [whatwg/dom] Allow subclassing of AbortController / AbortSignal (Issue #1162)

> doesn't allow for class fields or constructor initialisation logic in the signal

Return override permits this.

```js
class WatchSignal extends function(o) { return Object.setPrototypeOf(o, new.target.prototype); } {
  #fields = "here"
}

class WatchController extends AbortController {
  constructor() {
    new WatchSignal(super().signal);
  }
}
```

(Note the use of new.target.prototype in the “identity class”: honoring new.target.prototype permits further subclassing of WatchSignal without needing to do this again.)

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