Implement preriodic trusted process restarting for hotword detectors.

Bug: 188892570
Test: 1) adb shell cmd voiceinteraction restart-detection
2) Tried locally with restarting every 30 seconds, verified everything
works
3) adb shell ps | grep <test_package_name> - shows:

u0_a221       3328  1026 14501612 69208 0                   0 R com.google.th
u0_i9002      9049  1026 14448104 53860 0                   0 S com.google.th:com.google.th.SampleHotwordDetectionService:hotword_detector_3

Change-Id: I9f08943212c20b83da35c18df56460eaedbbf8f0