Copy parquet when possible
close https://github.com/huggingface/datasets-server/issues/1273

I use CommitOperationCopy from the huggingface_hub library, only available on `main` for now.

I don't do any check on the parquet row groups size but I think it's fine for now.

related to https://github.com/huggingface/datasets/pull/5935 in `datasets`
Copy parquet when possible: close https://github.com/huggingface/datasets-server/issues/1273

I use CommitOperationCopy from the huggingface_hub library, only available on `main` for now.

I don't do any check on the parquet row groups size but I think it's fine for now.

related to https://github.com/huggingface/datasets/pull/5935 in `datasets`