How to change auto scroll threshold when using KeyboardSensor?

[Ryota0312]

Thank you for creating a great dnd library!

Is there a way to change the auto scroll threshold when using KeyboardSensor?
I know autoScroll props in DnDContext is not effect to KeyboardSensor. (I think so autoScrollEnabled set to false in KeyboardSensor.)

I created a PullRequest (#1301).
If there is not way to change threshold, please review my PR and merge.

It is not work:

<DnDContext 
  autoScroll = {
    {
      x: 0.3,
      y: 0.3
    }
  }
// ...
>