MAGETWO-32783: Implement Gift message related interfaces

Author: irenelagno

dev/tests/static/testsuite/Magento/Test/Php/_files/whitelist/common.txt

@@ -63,7 +63,6 @@ app/code/Magento/Directory/Model/Resource/Region
 app/code/Magento/Eav/Model/Cache/Type.php
 app/code/Magento/GiftMessage/Model/Plugin
 app/code/Magento/GiftMessage/Model/Type/Plugin
-app/code/Magento/GiftMessage/Service
 app/code/Magento/GoogleShopping/Block/SiteVerification.php
 app/code/Magento/GoogleShopping/Model/AttributeFactory.php
 app/code/Magento/GroupedImportExport