Job system revamp

[Segfaultd]

This PR enhances the job system with several improvements:

Key Changes:

• Added proper job timing and statistics tracking
• Implemented condition variables to replace busy waiting
• Added support for futures to handle job results

Technical Details:

• Replaced recursive mutex with standard mutex for better performance
• Added timeout-based shutdown mechanism
• Improved error handling and logging
• Made singleton thread-safe

Testing:
The changes maintain backwards compatibility while adding new features. All existing functionality remains unchanged, with improved reliability and performance monitoring capabilities.