feat: Implement getData query and send a message action for slack

packages/backend/src/apps/slack/index.ts

@@ -1,4 +1,5 @@
 import Authentication from './authentication';
+import Data from './data';
 import {
   IService,
   IAuthentication,
@@ -8,8 +9,10 @@ import {
 
 export default class Slack implements IService {
   authenticationClient: IAuthentication;
+  data: Data;
 
   constructor(appData: IApp, connectionData: IJSONObject) {
     this.authenticationClient = new Authentication(appData, connectionData);
+    this.data = new Data(connectionData);
   }
 }