Display the gesture name on the TouchpadDebugView

Fetch the gesture type and display it on the TouchpadDebugView
while updating the view display each time a new gesture is received.
Made the view edges rounded.

Bug: 365562952
Test: Added unit tests to that sends a gesture type index to the
TouchpadDebugView and confirms the displayed gesture name matches
the sent one.
Flag: com.android.hardware.input.touchpad_visualizer

Change-Id: I42a9a09403905c0fff2d2cc693731db21083c7ff