Extract privacy item monitoring interface, add AppOpsPrivacyItemMonitor am: 3a89e62694 am: 7929de42bd am: ae15006335

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

Change-Id: I8bb250457fbe7588ef2144f5a13266cbc699ff3c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>