feat: Implement trigger serializer

packages/backend/src/serializers/trigger.js

@@ -0,0 +1,12 @@
+const triggerSerializer = (trigger) => {
+  return {
+    description: trigger.description,
+    key: trigger.key,
+    name: trigger.name,
+    pollInterval: trigger.pollInterval,
+    showWebhookUrl: trigger.showWebhookUrl,
+    type: trigger.type,
+  };
+};
+
+export default triggerSerializer;