Add NestedDraggable.Controller.autoStopNestedDrags

This CL adds a new autoStopNestedDrags flag to
NestedDraggable.Controller to automatically stop a nested drag as soon
as it does not consume some amount of scroll. This will be used by the
media player to implement the "swipe to gear icon" behavior.

Bug: 397989775
Test: atest NestedDraggableTest
Flag: EXEMPT new unused API
Change-Id: If4441298d18a8c7fa9e4a84bdfb3e86a5dc426a1