Add EventMetric and a single use case.

Adds an EventMetric class, associated unit tests, and an instance of the
EventMetric to DrmHal. Also added a unit test for CounterMetric and
created a class to hold all of the future metric instances.

BUG: 64001676

Test: Added and ran unit tests.  Also added a CTS test case.
Change-Id: Ic94bedd5f8293a58a939613a4ae69ce656a772be