Add Ultralytics actions workflow in format.yml

[UltralyticsAssistant]

This pull request adds a workflow to automatically format code and documentation.

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Ultralytics introduces new automated code formatting and updates JSON to YOLO conversion scripts.

📊 Key Changes

• 🆕 Added a GitHub workflow (format.yml) to automatically format code in PRs and main branch pushes.
• 🧹 Standardized quote usage in general_json2yolo.py for JSON keys from single to double quotes.
• ✏️ Replaced manual format strings with automated formatting in various print statements.
• 🗂 Introduced a new method to delete .DS_store files on datasets.
• 🛠 Various code cleanups in utils.py such as standardizing image and video formats to use double quotes.

🎯 Purpose & Impact

• The introduction of the code formatting workflow ensures consistent coding standards and improves code readability. This allows easier collaboration and code reviews.
• Modifications to scripts ease the conversion process of JSON files to the YOLO format, benefitting users who need to transform annotated datasets efficiently for object detection tasks.
• By cleaning and standardizing the code, the repository becomes more maintainable and accessible to new contributors or users who might not be as experienced in reading code.