WIP: drop labels in Image and Audio folders by default
will fix https://github.com/huggingface/datasets/issues/5153 and redundant labels displaying for most of the images datasets on the Hub (which are used just to store files)

TODO: discuss adding `drop_labels` (and `drop_metadata`) params to yaml
_The documentation is not available anymore as the PR was closed or merged._ close in favor of https://github.com/huggingface/datasets/pull/5192