[whatwg/fullscreen] Requesting orientation lock when going fullscreen (#186)

It might be nice to request a particular orientation when going fullscreen. The Screen Orientation API presupposes a "[pre-lock condition](https://www.w3.org/TR/screen-orientation/#dfn-pre-lock-conditions)", which in practice means "the document must be in fullscreen". 

Given that precondition, we could most of the Screen Orientation API and just request the allowed orientations when requesting fullscreen:

```JS
element.requestFullscreen({
  orientation: "landscape"
})
```

The advantages would be similar to those in #185:

  * orientation lock management is simplified and just tied to fullscreen... user exists full screen, then unlock of the orientation just happens.
  * prevent user annoyance, like arbitrary switching orientations (which the Screen Orientation API theoretically allows).




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