feat: write REST API endpoint to create connection

packages/backend/src/controllers/api/v1/apps/create-connection.js

@@ -0,0 +1,27 @@
+import { renderObject } from '../../../../helpers/renderer.js';
+
+export default async (request, response) => {
+  const connection = await request.currentUser
+    .$relatedQuery('connections')
+    .insertAndFetch(connectionParams(request));
+
+  const connectionWithAppConfigAndAuthClient = await connection
+    .$query()
+    .withGraphFetched({
+      appConfig: true,
+      appAuthClient: true,
+    });
+
+  renderObject(response, connectionWithAppConfigAndAuthClient, { status: 201 });
+};
+
+const connectionParams = (request) => {
+  const { appAuthClientId, formattedData } = request.body;
+
+  return {
+    key: request.params.appKey,
+    appAuthClientId,
+    formattedData,
+    verified: false,
+  };
+};