feat(slack): add get-current-user helper

packages/backend/src/apps/slack/common/get-current-user.ts

@@ -0,0 +1,13 @@
+import { IGlobalVariable, IJSONObject } from '@automatisch/types';
+
+const getCurrentUser = async ($: IGlobalVariable): Promise<IJSONObject> => {
+  const params = {
+    user: $.auth.data.userId as string,
+  }
+  const response = await $.http.get('/users.info', { params });
+  const currentUser = response.data.user;
+
+  return currentUser;
+};
+
+export default getCurrentUser;