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

AndroidManifest.xml

@@ -719,6 +719,13 @@
                        android:value="@string/menu_key_security"/>
         </activity>
 
+        <activity android:name=".Settings$PrivateSpaceBiometricSettingsActivity"
+                  android:label="@string/private_space_biometric_title"
+                  android:exported="false">
+            <meta-data android:name="com.android.settings.FRAGMENT_CLASS"
+                       android:value="com.android.settings.privatespace.onelock.PrivateSpaceBiometricSettings" />
+        </activity>
+
         <activity android:name=".bluetooth.DevicePickerActivity"
                 android:label="@string/device_picker"
                 android:configChanges="orientation|keyboardHidden|screenSize"