Saving to cloud doesn't work from inside isolates

[BernardinD]

When using the google_sign_in plugin from an isolate the plugin fails, likely due to locality issues.

Will supply logs later

[BernardinD]

Planned approach is to use the newest isolate feature flutterComputer() in order to run and wait for all the isolates to finish in the main thread and call backup from there like here.

Opened a ticket in isolate_handler to hopefully handle most of the work

NOTE: This might also be useful

[BernardinD]

Flutter's compute() might also be an option. Might be a more direct way to simply do the feature