Add ActivityOption to remove insecure keyguard when activity is launched.

Add a new ActivityOption#setDismissKeyguardIfInsecure remove keyguard
when an activity is launched while an insecure keyguard is shown. If
this option is set, WMS waits until the launched activity finishes
drawing its surface, then starts KEYGUARD_GOING_AWAY app transition.

Bug: 203044476
Test: atest KeyguardLockedTests KeyguardTransitionTests
Change-Id: I0f6a501baa2a60ae044bf1ef888e5e6f57a5f13e