Populate a new dreaming state to KeyguardInterator for wallpaper dream

Define a new dreaming state `isActiveDreamLockscreenHosted`
in KeyguardInteractor. The new state will be used to customize
the lockscreen views.
In wallpaper dream service, when dreaming starts/stops the updated
dreaming state will be set in KeyguardInteractor.

Bug: b/285061458
Test: atest KeyguardRepositoryImplTest; on device
Change-Id: I2347e4f1d7bf03ec0a0142671ba7a4157b6b7ab8