[DO NOT MERGE] Enforce persisted snoozed notifications limits

 Prevent DoS attack that causes boot-looping by serializing a huge amount of snoozed notifications:
  - Check snooze limits for persisted notifications
  - Remove persisted group summary notification when in-memory counterpart is removed
  - Prevent unpriviledged API calls that allow 3P apps to snooze notifications with context/criterion

Test: atest SnoozeHelperTest
Test: atest NotificationManagerServiceTest
Bug: 307948424
Bug: 308414141

(cherry picked from commit 965ff2d3)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:87c11b6df3d6ba696a8978a01ef5d66aeab45c8f)
Merged-In: I3571fa9207b778def652130d3ca840183a9a8414
Change-Id: I3571fa9207b778def652130d3ca840183a9a8414