Statsd - adb cmd for AppHook; long compare support

1. Create an adb command for statsd to let the adb user write AppHook to
the StatsLog buffer.
This can be used in the CTS tests (instead of relying on screen state
changes, etc. for conditioning), and for local testing.

2. Fixes the fact that AppHook loggers can spoof uids (they can put
whatever uid they want and statsd doesn't validate it - now it will).

3. Allow FieldValueMatcher to compare longs (not just ints).

Fix: 72266788
Fix: 72836157
Fix: 72872130
Fix: 72829733

Test: manually did the adb command.

Test: run cts-dev -m CtsStatsdHostTestCases -t android.cts.statsd.alert.AnomalyDetectionTests

Test: locally modified
android.cts.statsd.alert.BroadcastSubscriberTests#testBroadcastSubscriber
to have the app attempt both valid and invalid AppHook writes.

Change-Id: I68931a71805bcfa6fe56e7a0a0d3f07290cb78d1