#13776: Move isAllowed method from AccessChangeQuoteControl to separate service

 - Added strict_types declaration to new files according to 2.3 guidelines

Author: ishakhsuvarov

app/code/Magento/Quote/Api/ChangeQuoteControlInterface.php

@@ -4,6 +4,8 @@
  * See COPYING.txt for license details.
  */
 
+declare(strict_types=1);
+
 namespace Magento\Quote\Api;
 
 use Magento\Quote\Api\Data\CartInterface;

app/code/Magento/Quote/Model/ChangeQuoteControl.php

@@ -4,6 +4,8 @@
  * See COPYING.txt for license details.
  */
 
+declare(strict_types=1);
+
 namespace Magento\Quote\Model;
 
 use Magento\Authorization\Model\UserContextInterface;