feat: add s3 config to download_file call.

[pperanich]

Adding _s3_config specified in s3utils into the download_file call, similar to upload_fileobj.

[momchil-flex]

@magiWei could you take a look?

[lei-flex]

good catch. ship it.

[yaugenst-flex]

Hi @pperanich,

Thanks for your contribution! I was wondering if you could provide some context on why you added the S3 config to the download_file call. Was there a specific issue or necessity on your end that prompted this change?

Just trying to understand the motivation so we can ensure everything is aligned properly. Appreciate your insights!