Auth and DB Task Cancellation

## Please fill in the following fields:
Unity editor version:
Firebase Unity SDK version: 2018.3
Firebase plugins in use (Auth, Database, etc.): Auth, Database
Platform you are using the Unity editor on (Mac, Windows, or Linux): Mac
Platform you are targeting (iOS, Android, and/or desktop): Android

Just a question, is there any known way/example on cancelling auth and DB tasks?
I want to do something like a timeout and cancel started tasks in case of poor/no network. Additionally I need to cancel tasks if user leaves the screen while auth and DB tasks are not finished.