Implement LdapRule to limit user logins by objectclass.

Now logins are allowed by any objectclass unless LDAP_LOGIN_OBJECTCLASS is defined, we should be an array of allowed objectClass (any match).
Improvement for #245

app/Ldap/User.php

@@ -5,15 +5,19 @@ namespace App\Ldap;
 use Laravel\Passport\HasApiTokens;
 use LdapRecord\Models\OpenLDAP\User as Model;
 
+use App\Ldap\Rules\LoginObjectclassRule;
+
 class User extends Model
 {
 	use HasApiTokens;
 
 	/**
 	 * The object classes of the LDAP model.
+	 *
+	 * @note We set this to an empty array so that any objectclass can login
+	 * @see LoginObjectclassRule::class
 	 */
 	public static array $objectClasses = [
-		'posixAccount',
 	];
 
 	/* METHODS */