`ColorPickerHueRing` improvements

[JCapucho]

Adds a new option to toggle between the always win pan gesture recognizer with a new recognizer that checks if the pointer event is inside the ring.

And a onEnd callback that is called when the users finishes the pan gesture on the ring.

I implemented this options for a project I'm working on and since it might be useful to more people decided on upstreaming them, if this changes aren't desired feel free to close the PR.