Add Biometrics settings inside private space One Lock settings

This includes below changes:
- Add Biometrics preferernce in Private Space One Lock settings page
- Face and Fingerprint enrolment for Private profile
- Feature is behind flag android.multiuser.enable_biometrics_to_unlock_private_space

Screenshots:
go/ss/9cWZRAuvGGW7gMm.png
go/ss/B3NoFbL3KbpSzeN.png
go/ss/7xH3DLi9d6Lu2mR.png
go/ss/8WBEgKychWpduXg.png
go/ss/8pmPGshd9aiPvVC.png
go/ss/AFPBPbiaBBvTj3p.png
go/ss/3fE4XKLLUdP8LmF.png

Bug: 308862923
Test: atest CombinedBiometricStatusUtilsTest, atest FaceFingerprintUnlockControllerTest
Change-Id: I1853107a4df4fc97db53c97524c6d44a4f554e37

src/com/android/settings/core/gateway/SettingsGateway.java

@@ -165,6 +165,7 @@ import com.android.settings.print.PrintJobSettingsFragment;
 import com.android.settings.print.PrintSettingsFragment;
 import com.android.settings.privacy.PrivacyControlsFragment;
 import com.android.settings.privacy.PrivacyDashboardFragment;
+import com.android.settings.privatespace.onelock.PrivateSpaceBiometricSettings;
 import com.android.settings.regionalpreferences.RegionalPreferencesEntriesFragment;
 import com.android.settings.safetycenter.MoreSecurityPrivacyFragment;
 import com.android.settings.security.LockscreenDashboardFragment;
@@ -264,6 +265,7 @@ public class SettingsGateway {
             FingerprintSettingsV2Fragment.class.getName(),
             CombinedBiometricSettings.class.getName(),
             CombinedBiometricProfileSettings.class.getName(),
+            PrivateSpaceBiometricSettings.class.getName(),
             SwipeToNotificationSettings.class.getName(),
             DoubleTapPowerSettings.class.getName(),
             DoubleTapScreenSettings.class.getName(),