Implement workflow handlers for stored objects

Added new interface, EntityWorkflowWithStoredObjectHandlerInterface, which provides methods to handle workflows associated with stored objects. Two classes, AccompanyingPeriodWorkEvaluationDocumentWorkflowHandler and AccompanyingCourseDocumentWorkflowHandler, have been updated to implement this new interface. The EntityWorkflowManager class has also been updated to handle workflows associated with stored objects.

src/Bundle/ChillMainBundle/Workflow/EntityWorkflowWithStoredObjectHandlerInterface.php

@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\MainBundle\Workflow;
+
+use Chill\DocStoreBundle\Entity\StoredObject;
+use Chill\MainBundle\Entity\Workflow\EntityWorkflow;
+
+/**
+ * Add methods to handle workflows associated with @see{StoredObject}.
+ *
+ * @template T of object
+ *
+ * @template-extends EntityWorkflowHandlerInterface<T>
+ */
+interface EntityWorkflowWithStoredObjectHandlerInterface extends EntityWorkflowHandlerInterface
+{
+    public function getAssociatedStoredObject(EntityWorkflow $entityWorkflow): ?StoredObject;
+}