feat: add app connections w/ testing and deleting functions

packages/backend/src/graphql/mutations/create-connection.ts

@@ -1,5 +1,6 @@
 import { GraphQLString, GraphQLNonNull } from 'graphql';
 import Connection from '../../models/connection';
+import App from '../../models/app';
 import connectionType from '../types/connection';
 import twitterCredentialInputType from '../types/twitter-credential-input';
 import RequestWithCurrentUser from '../../types/express/request-with-current-user';
@@ -9,13 +10,17 @@ type Params = {
   data: object
 }
 const createConnectionResolver = async (params: Params, req: RequestWithCurrentUser) => {
+  const app = await App.findOneByKey(params.key);
   const connection = await Connection.query().insert({
     key: params.key,
     data: params.data,
     userId: req.currentUser.id
   });
 
-  return connection;
+  return {
+    ...connection,
+    app,
+  };
 }
 
 const createConnection = {