[Dataset] add MedShapeNet to datasets

[puririshi98]

🚀 The feature, motivation and pitch

https://medshapenet.ikim.nrw/ Adding this dataset to PyG w/ an example of training a simple GNN that would enable exploration at scale across the community for allowing AI to understand the plethora of complex medical shapes that exist

I will guide @jdhenaos, @loupl, and @ericauld in completing this task (cannot assign them as assignees unfortunately)

Alternatives

No response

Additional context

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[puririshi98]

I will guide @jdhenaos and @loupl in completing this task

[puririshi98]

@ericauld as well