Hub mode tutorial indicator

Show an indicator view on keyguard when hub mode related settings
are enabled and communal flag is on.
Once the tutorial completes, the indicator will be hidden.

Bug: b/301269121
Test: atest CommunalTutorialRepositoryImplTest
Test: atest CommunalTutorialInteractorTest
Test: enable feature flag communal_hub;
adb shell settings put secure hub_mode_tutorial_state 0
adb shell settings put secure hub_mode_tutorial_state 1
adb shell settings put secure hub_mode_tutorial_state 10

Change-Id: I018179ee6ad6d118dd94b9757a24e6e2f1e544e4