Update the Management UI to Enable/Disable 2FA For Users

User management is performed via the TwoFactorUser class. Users can be enabled for 2FA using mobile app OTPs or SMS OTPs. The transitioning state allows a user to upgrade from SMS to Mobile App OTPs. An administrator may perform user management, or users may enroll themselves.

The TwoFactorUser class exposes methods (actions) that may be performed on users.