Synchronize external OIDC provider users with LDAP

[hectorm]

Is your feature request related to a problem? Please describe. When logging in with a user from an external OIDC provider, the user is created in DefGuard if it does not exist, but is not synchronized with LDAP.

Describe the solution you'd like The user is synchronized with LDAP. Since it is an external user, the password hash cannot be stored.