resourcemanager: new implementation of resourcemanager

A new implementation (which inherits from the old implementation)
of the resource manager is added.
The new implementation is enabled only through the feature flag.
Also:
- Additional test cases are added for the new implementation.

Bug: 294886363
Test: atest android.media.misc.cts.ResourceManagerTest
      atest android.media.misc.cts.ResourceManagerMultiTest
      /data/nativetest64/ResourceManagerService_test/ResourceManagerService_test
      /data/nativetest64/ResourceObserverService_test/ResourceObserverService_test
Change-Id: I057bcd0abf8c7a2564a3f77090fdf06ec5915718