CLI command for inspecting checkpoints

[wyli]

Is your feature request related to a problem? Please describe.

python -m monai.bundle inspect_ckpt

to display some information about the variables and shapes saved. I saw similar util in tensorflow:

https://github.com/tensorflow/tensorflow/blob/064c7a3120f1571d7c90a777c787571787973518/tensorflow/python/tools/inspect_checkpoint.py#L163-L171

would also be good to have an option of computing hash value, it's used when creating a large_files.yml such as https://github.com/Project-MONAI/model-zoo/blob/dev/models/spleen_ct_segmentation/large_files.yml

cc @yiheng-wang-nv @Nic-Ma

[Zeesejo]

Hi @wyli — I'd like to work on this. I've opened a draft PR from my fork with an initial implementation.

My plan (exactly what the issue asks for, nothing more):

1. Add inspect_ckpt(path, print_all_vars=True, compute_hash=False, hash_type="md5") to monai/bundle/scripts.py — follows the same pattern as all existing bundle CLI commands
2. Export it from monai/bundle/__init__.py and monai/bundle/__main__.py so it's available as python -m monai.bundle inspect_ckpt --path model.pt
3. Add tests/bundle/test_bundle_inspect_ckpt.py with unit tests covering: key names, tensor shapes, dtypes, md5/sha256 hashing, and print_all_vars=True

What I did NOT change: auth logic, pagination, any other function — scope is strictly inspect_ckpt only.

Happy to adjust based on your feedback before the PR is ready for review.