Pretty print dataset info files
maybe just do it from now on no? (i.e. not for existing `dataset_infos.json` files) _The documentation is not available anymore as the PR was closed or merged._ > maybe just do it from now on no? (i.e. not for existing dataset_infos.json files)

Yes, or do this only for datasets created with `push_to_hub` to (always) keep the GH datasets small? 
 yep sounds good too on my side!  I reverted the change to avoid the size increase and added the `pretty_print` flag, which pretty-prints the JSON, and that flag is only True for datasets created with `push_to_hub`.  
Adds indentation to the `dataset_infos.json` file when saving for nicer diffs.

(suggested by @julien-c)

This PR also updates the info files of the GH datasets. Note that this change adds more than **10 MB** to the repo size (the total file size before the change: 29.672298 MB, after: 41.666475 MB), so I'm not sure this change is a good idea.

`src/datasets/info.py` is the only relevant file for reviewers.
