[CDM][Refactoring 3/N] Consolidate association cache and disk

1. Removed pending and revoked cache lists.
2. Refactored OnAssociationChanged callbacks.
3. Replaced previouslyUserIds map with maxId.

Bug: 327049496

Test: CTS
Change-Id: I6232d4046b84bd97d89f2eba4944fe031004afed
19 files changed