AC-8477: API page_cache/block/esi handles param enhancement

Author: rizwankhgl

app/code/Magento/PageCache/Controller/Block.php

@@ -4,6 +4,8 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\PageCache\Controller;
 
 use Magento\Framework\Serialize\Serializer\Base64Json;