Imagenet1k prep

[PaulScotti]

Changes made to get locally stored ImageNet1K to work as dataset

• new scripts to download imagenet1k inside folder "IN1K_prep"
• added einops scipy and h5py to requirements.txt as they were missing previously
• added name == main to topomoe/tests/test_train.py so I can run it directly from interactive job
• edits to topomoe/train.py such that if dataset=="folder" it will change dataloading to assume samples are coming from jpgs inside of a local folder (which contains a train/ and val/ folder where contents are subfolders of class IDs containing respective jpgs)