Add timeout parameter to HfApi.dataset_info to work on JZ

[lhoestq]

In certain environments such as the Jean Zay cluster, there is no internet connection and internet requests hang indefinitely.

To be able to properly raise an error in such cases instead of making the program hang, I think it would be nice to add a timeout parameter to HfApi.dataset_info that can be passed to requests.get.

The datasets CI has a test where it simulates such an environment. So when I try to use HfApi.dataset_info in datasets, it makes the CI fail.