Add dataset sizes (zipped)

[glenn-jocher]

Add size information (in GB) for each dataset. Objects365 size is estimated. @kalenmike

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Updates to dataset configuration files in the YOLOv5 repository.

📊 Key Changes

• Modifications in the configuration YAML files for various datasets.
• No change to the dataset paths or structures, but clear adjustments to the version control reflectors (no direct impact on the dataset usage).

🎯 Purpose & Impact

• These changes appear to be minor and possibly housekeeping in nature, as there is no change in the actual content aside from differing hash values (potentially indicating updated versions of files without changing content).
• Users should expect no impact on their workflows unless these hash differences somehow correspond to internal structural changes not specified in the PR diff.