Add history support to StoredObject entity

This commit adds a history saving feature to the StoredObject entity, which allows saving versions of the object's changes over time. This is achieved by implementing a saveHistory method that captures data attributes like filename, IV, key information, and type. The corresponding Automated tests were also created. Furthermore, adjustments were made to the StoredObject test to align with the new feature.

src/Bundle/ChillDocStoreBundle/Form/DataMapper/StoredObjectDataMapper.php

@@ -59,8 +59,8 @@ class StoredObjectDataMapper implements DataMapperInterface
 
         /** @var StoredObject $viewData */
         if ($viewData->getFilename() !== $forms['stored_object']->getData()['filename']) {
-            // we do not want to erase the previous object
-            $viewData = new StoredObject();
+            // we want to keep the previous history
+            $viewData->saveHistory();
         }
 
         $viewData->setFilename($forms['stored_object']->getData()['filename']);