Re: [whatwg/fetch] Proposal: fetch with multiple AbortSignals (#905)

Great comment from @jakearchibald.

Some proposed changes -
1. Propagate reason from the aborted signal to the wrapper signal;
2. Don't attempt unsubscribe if subscription hasn't been done yet;
3. Typescript added.

```typescript
function anySignal(signals: AbortSignal[]) {
    const controller = new AbortController();
    const unsubscribe: (() => void)[] = [];

    function onAbort(signal: AbortSignal) {
        controller.abort(signal.reason);
        unsubscribe.forEach((f) => f());
    }

    for (const signal of signals) {
        if (signal.aborted) {
            onAbort(signal);
            break;
        }
        const handler = onAbort.bind(undefined, signal);
        signal.addEventListener('abort', handler);
        unsubscribe.push(() => signal.removeEventListener('abort', handler));
    }

    return controller.signal;
}
```

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