Show the value of the pressure on touchpad visualizer

Displaying the value of the pressure reported by the touchpad hardware state for each finger. The pressure value is being displayed on the top of the ovals that represents the fingers and follow the oval wherever it moves to.

Test: Build
Test: Presubmit checks
Bug: 368692662
Flag: com.android.hardware.input.touchpad_visualizer
Change-Id: Iafb29c19623480a7bc301786f284eb6a6c4a152d