Function list_hdf5_tree 

pub fn list_hdf5_tree(
    path: &Path,
    max_depth: usize,
) -> Result<Vec<Hdf5TreeEntry>, IoError>

List the group/dataset tree structure of an HDF5 file.

Walks the file hierarchy recursively up to max_depth levels deep, returning entries with their path, kind (group vs dataset), and shape (for datasets). Useful for displaying file structure in a GUI browser.