Use compat framework to gate system managed media service transitions.

Changes in this commit introduces compat framework which allows:
a. enable/disable change per app.
b. report changes which help root cause issue.

Test: atest cts/tests/app/src/android/app/cts/ActivityManagerNotifyMediaFGSTypeTest.java
Flag: com.android.media.flags.enable_notifying_activity_manager_with_media_session_status_change
BUG: 281762171

Change-Id: I46cce41630ad6305754ea00438768fdd376c022b
Signed-off-by: Pradeep Sawlani <sawlani@google.com>