Adding support for GCP & Google Drive

[stantonius]

Hey there. Awesome plugin. I have learnt a lot from reading your code, so thanks for your efforts.

Wanted to see if you had any interest in adding support for other services? I forked this project and added my own support for GCP Cloud Storage here. It is working for my needs and there is more to do to make it stable, but I first wanted to see if you'd be keen to add this type of functionality. If yes, I will polish it further and submit a PR?

Let me know