Add new scripts for CSV validation and dataset processing, including checks for column values and generating node roles

rename expected speed note to English DyGFormer runtime guide and link it from DATA README

Fix case sensitivity in dataset directory names in README.md

Update README.md to clarify dataset structure and normalization notes

Update README.md to correct filename for topology cache

Update .gitignore and add full_graph_with_reverse_edges.npz files for multiple datasets

Update edges.csv files with new file sizes and hashes

Add full_graph.npz files for multiple datasets and update README.md for clarity

remove raw_data

Update README.md to enhance dataset documentation and structure

Add FROST datasets snapshot