feat: Introduce flow serializer

packages/backend/src/serializers/flow.js

@@ -0,0 +1,18 @@
+import stepSerializer from './step.js';
+
+const flowSerializer = (flow) => {
+  let flowData = {
+    id: flow.id,
+    name: flow.name,
+    active: flow.active,
+    status: flow.status,
+  };
+
+  if (flow.steps) {
+    flowData.steps = flow.steps.map((step) => stepSerializer(step));
+  }
+
+  return flowData;
+};
+
+export default flowSerializer;