implementing concurrent codec metrics

Following changes are made in this CL:
- extend IResourceManagerService interface to allow:
  - notify create/start/stop of codecs
- implement concurrent codec metrics with different
  buckets (such as different resolution, codec type)
  for all the application/process and for the system.
- push the codec concurrency metrics to statsd
- move all metrics to a different class
- update codec reported metrics with codec id

Bug: 265488359
Test: atest cts/tests/media/misc/src/android/media/misc/cts/ResourceManagerTest.java
      /data/nativetest64/ResourceManagerService_test/ResourceManagerService_test
      /data/nativetest64/ResourceObserverService_test/ResourceObserverService_test
      refactoring CL. Existing unit tests still pass.
Merged-In: Ibaa1fb9607e486f2eb79bf02d79c630e09d62b4a
Change-Id: Ibaa1fb9607e486f2eb79bf02d79c630e09d62b4a