Extract privacy item monitoring interface, add AppOpsPrivacyItemMonitor am: 3a89e62694 am: 1050228489

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18375273

Change-Id: I82db58dbccee01513b619f13870439f87c2b04f1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>