Re: [whatwg/dom] Add AbortSignal.timeout(ms) (#951)

@keithamus Interesting! I think we could do that by combining with `AbortController.follow()` from #920:
```javascript
async function handleRequest(signal) {
  const dbController = new AbortController();
  dbController.follow(signal);
  dbController.follow(AbortSignal.timeout(2_000));
  await readFromDatabase(dbController.signal);
}

await handleRequest(AbortSignal.timeout(10_000));
```
The `readFromDatabase()` call will be aborted after either the parent request's deadline has passed, or the 2-second deadline has passed (whichever happens first).

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