Add MedImg for streaming
### Feature request

Host the MedImg dataset (similar to Imagenet but for biomedical images). 

### Motivation

There is a clear need for biomedical image foundation models and large scale biomedical datasets that are easily streamable. This would be an excellent tool for the biomedical community.

### Your contribution

MedImg can be found [here](https://www.cuilab.cn/medimg/#).
@mariosasko, @lhoestq, @albertvillanova
Hello! Can anyone help? or can you guys suggest who can help with this? Hi ! Feel free to download the dataset and create a `Dataset` object with it.

Then your'll be able to use `push_to_hub()` to upload the dataset to HF in Parquet format and make it streamable :) > Hi ! Feel free to download the dataset and create a `Dataset` object with it.
> 
> Then your'll be able to use `push_to_hub()` to upload the dataset to HF in Parquet format and make it streamable :)

The dataset is several TB in total, which I do not have the resources to handle.