[CS598] Add HAM10000 Dataset

[kdural2]

Type: Dataset Contribution Paper Title: The HAM10000 dataset: A large collection of multi-source dermatoscopic images of pigmented lesions Paper Link: https://www.nature.com/articles/sdata2018161 Dataset: https://www.kaggle.com/datasets/kmader/skin-cancer-mnist-ham10000

Description: Adds the HAM10000 dataset with basic tests. This dataset contains 10,015 dermoscopic lesion images across 7 classes

Files changed: pyhealth/datasets/init.py

Files added: pyhealth/datasets/configs/ham10000.yaml pyhealth/datasets/ham10000.py tests/core/test_ham10000.py