Add .tar support for datasets

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Enhanced file extraction capabilities in download utility.

📊 Key Changes

• Expanded the support for unzipping files to include .tar archives.
• Integrated command to extract .tar files after download.

🎯 Purpose & Impact

• Purpose: To improve the download utility's ability to handle more types of compressed files automatically.
• Impact: Users benefit from streamlined downloading and extraction of .tar files, facilitating easier access to datasets or models packaged in this format. This reduces manual steps and can enhance the user experience when setting up or updating machine learning models within the YOLOv5 framework. 📦🛠️