Updated MediaGallery modules and marked as API

Author: Stanislav Idolov

app/code/Magento/MediaGalleryCatalog/etc/di.xml

@@ -7,6 +7,6 @@
 -->
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
     <type name="Magento\Catalog\Model\Product\Gallery\Processor">
-        <plugin name="media_gallery_image_remove_metadata" type="Magento\MediaGallery\Plugin\Product\Gallery\RemoveAssetAfterRemoveImage"/>
+        <plugin name="media_gallery_image_remove_metadata" type="Magento\MediaGalleryCatalog\Plugin\Product\Gallery\RemoveAssetAfterRemoveImage"/>
     </type>
 </config>