Native ANR timer implementation

This provides a native ANR timer service.  The service depends on the
timer_fd Linux utility, which does not exist on Windows, so the
service is unavailable there. The AnrTimer service is disabled on
systems that cannot support the native service.

Test: atest
 * FrameworksServicesTests:com.android.server.am
 * FrameworksMockingServicesTests:com.android.server.am
 * CtsAppTestCases
 * FrameworksServicesTests:AnrTimerTest

Bug: 282428924

Change-Id: Ie360232c090255487cd48aeedd19841fdb9ddab3