Add async handling for signature state changes

Introduce MessageBus to handle post-signature operations asynchronously. This ensures that further steps are executed through dispatched messages, improving system scalability and performance. Implement new handlers and messages for the workflow state transitions.

src/Bundle/ChillMainBundle/Workflow/Messenger/PostSignatureStateChangeHandler.php

@@ -0,0 +1,41 @@
+<?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\Messenger;
+
+use Chill\MainBundle\Repository\Workflow\EntityWorkflowStepSignatureRepository;
+use Chill\MainBundle\Workflow\SignatureStepStateChanger;
+use Doctrine\ORM\EntityManagerInterface;
+use Symfony\Component\Messenger\Exception\UnrecoverableMessageHandlingException;
+use Symfony\Component\Messenger\Handler\MessageHandlerInterface;
+
+final readonly class PostSignatureStateChangeHandler implements MessageHandlerInterface
+{
+    public function __construct(
+        private EntityWorkflowStepSignatureRepository $entityWorkflowStepSignatureRepository,
+        private SignatureStepStateChanger $signatureStepStateChanger,
+        private EntityManagerInterface $entityManager,
+    ) {}
+
+    public function __invoke(PostSignatureStateChangeMessage $message): void
+    {
+        $signature = $this->entityWorkflowStepSignatureRepository->find($message->signatureId);
+
+        if (null === $signature) {
+            throw new UnrecoverableMessageHandlingException('signature not found');
+        }
+
+        $this->signatureStepStateChanger->onPostMark($signature);
+
+        $this->entityManager->flush();
+        $this->entityManager->clear();
+    }
+}

src/Bundle/ChillMainBundle/Workflow/Messenger/PostSignatureStateChangeMessage.php

@@ -0,0 +1,22 @@
+<?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\Messenger;
+
+/**
+ * Message which is dispatched after a notification has a step changed.
+ */
+class PostSignatureStateChangeMessage
+{
+    public function __construct(
+        public int $signatureId,
+    ) {}
+}