Detect 5 tap power button click and log in logcat

Cavaet -  the detection algorithm is super naive and doesn't address
gesture conflict with camera. Will do it properly later after
prototyping.

Test: looked at log
Test: atest GestureLauncherServiceTest
Bug: 161394591
Change-Id: I9077767eee07f2d49b39da644fb93bf6d5b41ffd