[whatwg/fullscreen] Introduce document.exitFullscreen({ fully: true })? (#70)

Split from https://github.com/whatwg/fullscreen/pull/65

This would expose to the web a primitive that's used internally when navigating and when the user presses Esc (or similar), and would make it easier to test. The IDL would look like:

```WebIDL
partial interface Document {
  Promise<void> exitFullscreen(optional ExitFullscreenOptions options);
};

dictionary ExitFullscreenOptions {
  boolean fully = false;
};
```

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