Re: [whatwg/fetch] Consider to add "resolveAtIdleTime" to RequestInit (#821)

Just having a general function, say waitForIdle, looks simpler to me. We can use it with timeout fairly easily.

```
function wait(ms) { return new Promise(res => setTimeout(res, ms)); }
const timeout = wait(100);
const resp = await fetch(...);
await Promise.race([waitForIdle(), timeout]);
```

This actually executes tiny code when it's not idle, but I think we can bear with it.


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