Add dataloader for Jiang et al

[Zethson]

Description of feature

https://www.biorxiv.org/content/10.1101/2024.01.29.576933v2.full

https://zenodo.org/records/10520190

[namsaraeva]

See https://github.com/theislab/pertpy-datasets/... for current status of the issue.

The objects are too large to be uploaded now.