[Permissions Hub Refactor] Expose AppOpsManager#OnOpNotedListener and

AppOpsManager#start/stopWatchingNoted as System API

* Expose AppOpsManager#OnOpNotedListener and
AppOpsManager#start/stopWatchingNoted as System API as we would like
Permissions Hub UI to listen for app op notes to update its UI (which
shows apps that have recently accessed permissions)
* Current these methods take integer op as parameter
  which is not allowed for API (String op names need to be used instead), so we need to separate into different interfaces for internal/external use. Refactor existing usages of OnOpNotedListener to use OnOpNotedListenerInternal instead.

Bug: 258257361
Test: atest CtsAppOpTestCases:AppOpsTest
Change-Id: I3d87e6e33ec6fdafed4b3b2f6d029a8fb47bf355