Is your feature request related to a problem? Please describe.
The ListObjectsV2 implementation currently does not return the StorageClass for each object.

Other implementations (minio, ceph, hetzner, AWS, localstack, garage) always incude it in their responses.

Describe the solution you'd like
Always include it. It seems that it's currently explicitly removed from the metadata if it is standard:

Additional context
https://docs.aws.amazon.com/AmazonS3/latest/API/API_ListObjectsV2.html