Add ldap login fallback to native login

- Allow falling back to native login if ldap fails
- Read configuration to enable / disable the fallback

config/core_services.yaml

@@ -147,6 +147,14 @@ services:
       - !abstract options
       - '@?property_accessor'
 
+  security.listener.json_login_ldap.main:
+    class: App\Security\Ldap\AppCheckLdapCredentialsListener
+    tags:
+      - name: 'kernel.event_subscriber'
+        dispatcher: security.event_dispatcher.main
+    arguments:
+      - '@security.ldap_locator'
+
   App\Security\LegacySessionLogoutHandler:
     tags:
       - name: 'kernel.event_listener'