feat: add two-factor authentication support and related configurations

.env.example

@@ -67,6 +67,8 @@ AUTH_ENABLE_REGISTRATION=true
 AUTH_ENABLE_PASSWORD_RESET=true
 AUTH_ENABLE_REMEMBER_ME=true
 AUTH_ENABLE_EMAIL_VERIFICATION=false
+AUTH_ENABLE_TWO_FACTOR=false
+AUTH_REQUIRE_TWO_FACTOR=false
 
 # Auth Redirects
 # AUTH_REDIRECT_LOGIN=/dashboard