This change is the first of many, it will
1. Change java -> kotlin
2. Use the MVVM architecture
3. Be feature flagged
This change in particular is focused on transitions to and from various activities.
Enable feature via
adb shell setprop sys.fflag.override.settings_biometrics2_fingerprint true
Bug: 280862076
Test: atest FingerprintSettingsViewModelTest
Change-Id: I8eb5c30e6f2e92c256ae7c257a9d560439ba418f
Merged-In: I8eb5c30e6f2e92c256ae7c257a9d560439ba418f
b7f0d7a8ff