feat: write REST API endpoint to generate auth url

packages/backend/src/controllers/api/v1/connections/generate-auth-url.js

@@ -0,0 +1,14 @@
+import { renderObject } from '../../../../helpers/renderer.js';
+
+export default async (request, response) => {
+  let connection = await request.currentUser
+    .$relatedQuery('connections')
+    .findOne({
+      id: request.params.connectionId,
+    })
+    .throwIfNotFound();
+
+  connection = await connection.generateAuthUrl();
+
+  renderObject(response, connection);
+};