support progress tracking for DownloadFile and UploadFile methods for service/dataset client

[98sean98]

Need some kind of progress tracking for the DownloadFile and UploadFile methods, otherwise there's no way for the consumer of these methods to know how many bytes have been transferred, and how many more bytes left to transfer.

Previous investigation:
Each of the cloud client's download object methods are kinda different. Perhaps aws s3 and gcp cloud storage are okay because they use io.Copy methods, but not azure. Azure actually has at least 2-3 methods that allows blob download, involving some kind of stream or buffer.
And for upload object methods, they're all different also.

If this feature can be implemented, it will be possible to render a progress bar for downstream consumers like deploifai/cli-go.