Allow train to use zipped content

[kalenmike]

This allows training with a dataset zip file with zipped content and not only a zipped folder.

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Improved dataset downloading and extraction handling within YOLOv5.

📊 Key Changes

• Dataset downloading now extracts contents into a subdirectory named after the dataset, rather than the generic DATASETS_DIR.

🎯 Purpose & Impact

• Purpose: This change is intended to organize datasets better by creating a dedicated directory for each one, which prevents potential file overwrites and makes it easier to manage multiple datasets.
• Impact: Users will benefit from a cleaner directory structure and reduced risk of dataset files interfering with one another, potentially improving overall user experience with dataset management. 🗂️

[glenn-jocher]

@kalenmike PR is merged!