Refactor FingerprintStateListener to BiometricStateListener

This will allow to reuse the logic around onEnrollmentsChanged for face.

Face doesn't have a mechanism to cache the enrollment state, and there
is nothing fingerprint-specific in FingerprintStateListener, so it's an
obvious choice the refactor this class to support all biometrics.

Bug: 221037350
Test: atest com.android.server.biometrics
Test: atest com.android.systemui.biometrics
Test: atest KeyguardUpdateMonitorTest
Test: com.android.server.biometrics
Change-Id: Id039136c8fb01627de5a0f3e92d2f9fd89500539