feat: Implement get flow API endpoint

packages/backend/test/mocks/rest/api/v1/flows/get-flow.js

@@ -0,0 +1,32 @@
+const getFlowMock = async (flow, steps) => {
+  const data = {
+    active: flow.active,
+    id: flow.id,
+    name: flow.name,
+    status: flow.active ? 'published' : 'draft',
+    steps: steps.map((step) => ({
+      appKey: step.appKey,
+      iconUrl: step.iconUrl,
+      id: step.id,
+      key: step.key,
+      parameters: step.parameters,
+      position: step.position,
+      status: step.status,
+      type: step.type,
+      webhookUrl: step.webhookUrl,
+    })),
+  };
+
+  return {
+    data: data,
+    meta: {
+      count: 1,
+      currentPage: null,
+      isArray: false,
+      totalPages: null,
+      type: 'Flow',
+    },
+  };
+};
+
+export default getFlowMock;