Implement global circular reference handler in line with latest symfony practices and remove now redundant code from current normalizers

src/Bundle/ChillMainBundle/Serializer/CircularReferenceHandler.php

@@ -0,0 +1,17 @@
+<?php
+namespace Chill\MainBundle\Serializer;
+
+class CircularReferenceHandler
+{
+    public function handle(object $object, ?string $format = null, array $context = []): mixed
+    {
+        if (method_exists($object, 'getId')) {
+            return [
+                'id' => $object->getId(),
+                '_class' => (new \ReflectionClass($object))->getShortName(),
+            ];
+        }
+
+        return spl_object_id($object);
+    }
+}