Add SideFps AlternateBouncer

Only enabled if MODERN_ALTERNATE_BOUNCER is enabled.

Bug: 237362467
Test: manual, normal cases
  1. enable MODERN_ALTERNATE_BOUNCER flag
  2. enroll side FPS
  3. tap on a notification with an intent on LS
  4. Observe: SideFPS bouncer, can auth from here
  5. Repeat step 3
  6. tap anywhere on screen
  7. Observe: primary bouncer shows and side fps UI is still
  showing
Test: manually check alternate bouncer doesn't show
if fp is locked out
Test: atest SideFpsControllerTest
Test: atest DeviceEntryFingerprintAuthRepositoryTest
Test: atest AlternateBouncerInteractorTest

Change-Id: I5f02e0f67799df059a35dce34b8a12833ce5fac5