Add an example that uses gsutil rsync or rclone for a cloud provider independent file folder syncing

[aszs]

Create an example that copies a directory of files that works with a few cloud provider's cloud storage offerings. An example that worked with GCP, AWS S3, and minio would be enough.
It could use either gsutil rsync which supports GCP Cloud Storage and AWS S3 and more I think (needs investigation) or rclone which supports many more.