Add check_python()

[glenn-jocher]

Checks python version against minimum version of 3.7.0.

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Improvements in Python version checking and dependency management.

📊 Key Changes

• Added a function check_python to verify the current Python version against a minimum required version.
• Integrated Python version check into the check_requirements function.

🎯 Purpose & Impact

• Ensures that YOLOv5 is used with a compatible Python version, meeting a minimum version standard (🐍 Python >= 3.7.0).
• Prevents potential issues related to incompatibilities with older Python versions, improving user experience by providing clearer requirements (🚫 fewer bugs & errors).
• Users are now automatically alerted if their Python version is not up to par, avoiding troubleshooting and support requests (🔍 easier debugging).