feat: Implement create flow rest API endpoint

packages/backend/src/controllers/api/v1/flows/create-flow.js

@@ -0,0 +1,11 @@
+import { renderObject } from '../../../../helpers/renderer.js';
+
+export default async (request, response) => {
+  let flow = await request.currentUser.$relatedQuery('flows').insert({
+    name: 'Name your flow',
+  });
+
+  flow = await flow.createInitialSteps();
+
+  renderObject(response, flow, { status: 201 });
+};