Upload progress

[cvatricks]

I couldn't find the example for retrieve upload progress. (in percentage as well as file size)

Requesting you to please help me.

[shcheklein]

@cvatricks please take a look here - https://github.com/iterative/dvc/blob/40bdf613f0779aedee6298d6df5700ae10fa6d9c/dvc/tree/gdrive.py#L348 , but it requires the maintained version of the lib - PyDrive2