Migrate api's to use async and change their import in server js

[komalahuwalia]

Before your pull request is reviewed and merged, please ensure that:

• there are no linting errors
• your code is in a uniquely-named feature branch and has been rebased on top of the latest master. If you're asked to make more changes, make sure you rebase onto master then too!
• your pull request is descriptively named and links to an issue number, i.e. Fixes #123
• Make sure you have run the tests!!
  • Integration test & Server unit tests - run npm run allTest from the server folder
  • Client unit test - run npm run test from client folder
  • End to End test - run npm run test from the root folder

Thank you!