Google cloud storage and others

[isik-kaplan]

Hi there,

I see that this project supports different backends for storage systems that one can extend, file system storage and s3 comes with the library itself, so that file system, amazon, digital ocean storage are all covered, but I was wondering if you are planning to add google and azure to the mix, I'm especially asking it in regards to the google part as I almost exclusively use google services in my projects.