Add screen state, dozeTimeTick to keyguard repository

... to support upcoming migration of keyguard status view, logic will
first need to move out of NPVC and CentralSurfacesImpl.

Bug: 288242803
Test: atest KeyguardRepositoryImplTest
Change-Id: I1dca48a4f4a91f1be6bc082ba0e8c2c06cbc6366