Pass all input events to MetricsManager

The MetricsManager needs to receive UP/CANCEL events to trigger
atom reporting. I must have moved these lines around during the
refactor and overlooked this mistake.

This change also modifies MotionPredictor and MetricsManager to
hold a "ReportAtomFunction" to facilitate testing.

Test: `statsd_testdrive 718` shows atoms reported with `adb shell setenforce 0`.
Test: `atest frameworks/native/libs/input/tests/MotionPredictor_test.cpp -c` passes.
Test: `atest frameworks/native/libs/input/tests/MotionPredictorMetricsManager_test.cpp -c` passes.

Bug: 311066949

Change-Id: Icbb709bbb7cf548512e0d9aa062783d554b857e3