Biometric Scheduler Watchdog

Added a watchdog to kill hung operations within the biometric scheduler.
The watchdog will cancel/remove all pending and the current running
operation if it is not finished with 10 seconds.

Test: Manual
Test: atest BiometricSchedulerTest
Fixes: 243445002
Change-Id: I877fec8d674be204b922088d072afe00f99b6635