Add private APIs to watch noted app ops - framework.

This change adds simple APIs to watch for noted ops. We are now
reporting a callback for every note which could lead to too many
call but until this is found to be the case we stick to the simple
solution. We already have APIs to watch started and stopped ops
which in theory could have the same frequence as noted ops, so
this is consistent to our approach.

bug:117617221
bug:119323172

Test: atest androidx.test.runner.AndroidJUnitRunner

Change-Id: I46c4b00e765eb14df8c30471d2b80dda905b8125