Add support for saving labels as text (save_txt)

[amanbasu]

Implemented save_one_txt() function to save labels as text files.

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Enhancement of prediction saving options in validation script.

📊 Key Changes

• Uncommented and updated the section of code that saves prediction results to a .txt file.
• Added a new function called save_one_txt responsible for formatting and saving the predictions in the correct label format.

🎯 Purpose & Impact

• 🎯 Purpose: To provide users with the ability to save model predictions in a text format, which is useful for various post-processing tasks, like evaluating model performance or further analysis.
• 💡 Impact: Users can now save detailed prediction results on a per-image basis, facilitating a more granular review process. This can be especially valuable to researchers and practitioners who require an in-depth examination of model outputs.

[github-actions]

CLA Assistant Lite bot All Contributors have signed the CLA. ✅

[github-actions]

👋 Hello @amanbasu, thank you for submitting a YOLOv8 🚀 PR! To allow your work to be integrated as seamlessly as possible, we advise you to:

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[amanbasu]

I have read the CLA Document and I sign the CLA

[amanbasu]

recheck

[glenn-jocher]

@amanbasu PR merged into updates for next release. Thank you for your contributions!