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

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

Change-Id: I3b6d3a611a3688bd2a304e397afb10f6a9ea3399
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>