Introduce LocalBackupPasswordPreferenceController

 - Create new LocalBackupPasswordPreferenceController
 - Create controller inside the DashboardFragment
 - Port logic from DevelopmentSettings into the controller

Bug: 34203528
Test: make RunSettingsRoboTests -j40
Change-Id: I86d0d2402e8092e9f03498254ae4e3bf7bb9bf3d
3 files changed