Abstract external storage
Features:

- use S3 in production and a docker volume in tests: https://github.com/huggingface/datasets-server/pull/1882#issuecomment-1740688443
- delete all the assets or temporary files associated with a cache response (https://github.com/huggingface/datasets-server/pull/1884#discussion_r1340643599)

Abstract external storage: Features:

- use S3 in production and a docker volume in tests: https://github.com/huggingface/datasets-server/pull/1882#issuecomment-1740688443
- delete all the assets or temporary files associated with a cache response (https://github.com/huggingface/datasets-server/pull/1884#discussion_r1340643599)
