Extend ANR timer to ActiveServices

Implement SERVICE_TIMEOUT, SHORT_FGS_ANR_TIMEOUT, and
FOREGROUND_TIMEOUT with AnrTimer instances.

This also changes the AnrTimer.Error timestamp to be a long
(milliseconds since the epoch) instead of a string.

A few editorial updates were made to address comments from earlier
changes. Comments were updated in BroadcastQueueModernImpl and some
method names were changed in AnrTimer.

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

Bug: 282428924

Change-Id: I0ff70a9d5b7d4e2b66125aaedebf4bc0064f871c