feat: Implement get app connections API endpoint

packages/backend/src/controllers/api/v1/apps/get-connections.js

@@ -0,0 +1,24 @@
+import { renderObject } from '../../../../helpers/renderer.js';
+import App from '../../../../models/app.js';
+
+export default async (request, response) => {
+  const app = await App.findOneByKey(request.params.appKey);
+
+  const connections = await request.currentUser.authorizedConnections
+    .clone()
+    .select('connections.*')
+    .withGraphFetched({
+      appConfig: true,
+      appAuthClient: true,
+    })
+    .fullOuterJoinRelated('steps')
+    .where({
+      'connections.key': app.key,
+      'connections.draft': false,
+    })
+    .countDistinct('steps.flow_id as flowCount')
+    .groupBy('connections.id')
+    .orderBy('created_at', 'desc');
+
+  renderObject(response, connections);
+};