To Do: Configure ParseServer to utilize FCM for verification code during sign up

[henrylao]

Resources:

• https://guides.codepath.com/android/Push-Notifications-Setup-for-Parse#add-parse-cloud-code
• https://www.back4app.com/docs/android/push-notifications/parse-server-push-notifications
• https://www.back4app.com/docs/android/push-notifications/parse-push-notifications
• https://www.tothenew.com/blog/push-notifications-using-firebase-cloud-messaging/