1/n Start adding Face settings (base, intro)

This change refactors common biometric settings code as well to minimize
duplicated code in areas such as:
    Preference Controller
    EnrollBase
    EnrollIntro

This change also updates ChooseLock to have Face + Pin/Pattern/Pass

Bug: 110589286

Test: Fingerprint settings/enrollment still works
Test: make -j56 RunSettingsRoboTests
Change-Id: Ie35406a01b85617423beece42683ac086e9bc4a7

src/com/android/settings/biometrics/fingerprint/SetupFingerprintEnrollIntroduction.java

@@ -97,7 +97,7 @@ public class SetupFingerprintEnrollIntroduction extends FingerprintEnrollIntrodu
     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
         // if lock was already present, do not return intent data since it must have been
         // reported in previous attempts
-        if (requestCode == FINGERPRINT_FIND_SENSOR_REQUEST && isKeyguardSecure()
+        if (requestCode == BIOMETRIC_FIND_SENSOR_REQUEST && isKeyguardSecure()
                 && !mAlreadyHadLockScreenSetup) {
             data = getMetricIntent(data);
         }