[mednet.tests] Move tests to single directory

...histograms/models/histograms_pasa_montgomery_default.json

tests/__init__.py

tests/classification/__init__.py

tests/classification/conftest.py

...tograms/models/histograms_alexnet_montgomery_default.json

...ms/models/histograms_densenet-121_montgomery_default.json

...histograms/models/histograms_pasa_montgomery_default.json

...ion/data/histograms/raw_data/histograms_hivtb_fold_0.json

...n/data/histograms/raw_data/histograms_indian_default.json

...ta/histograms/raw_data/histograms_montgomery_default.json

.../raw_data/histograms_montgomery_preprocessed_default.json

...ata/histograms/raw_data/histograms_nih_cxr14_default.json

...n/data/histograms/raw_data/histograms_padchest_idiap.json

...data/histograms/raw_data/histograms_shenzhen_default.json

...ion/data/histograms/raw_data/histograms_tbpoc_fold_0.json

...data/histograms/raw_data/histograms_tbx11k_v1_fold_0.json

...data/histograms/raw_data/histograms_tbx11k_v2_fold_0.json

tests/classification/data/lfs/.gitattributes

tests/classification/data/lfs/.gitignore

tests/classification/data/lfs/README.md