Updated namespace and added missing class for command annotation. (#417)

Author: sebas5384

src/Command/PersistQueryMapCommand.php

@@ -2,6 +2,7 @@
 
 namespace Drupal\graphql\Command;
 
+use Drupal\Console\Annotations\DrupalCommand;
 use Drupal\Console\Core\Command\Shared\CommandTrait;
 use Drupal\Core\Entity\EntityTypeManagerInterface;
 use Symfony\Component\Console\Input\InputArgument;