refactor: modernize log utilities with ES6 classes and syntax

[Puxhkar]

Description

This PR modernizes the lib/utils/log.js module by refactoring it to use ES6 classes and modern JavaScript syntax (ES6+). These changes improve code readability and maintainability while ensuring full backward compatibility with the existing codebase.

Changes

• ES6 Class Refactor: Converted the legacy Logger constructor and prototype-based methods into a modern class Logger structure.
• Modern Syntax Adoption:
  • Replaced var with const and let for improved scoping.
  • Adopted template literals for cleaner and more readable string construction.
  • Used arrow functions for more concise callbacks.
  • Used shorthand property names in object literals.
• Code Cleanup: Removed legacy architectural "question" comments to streamline the source code.
• Backward Compatibility: Maintained the factory function export pattern. This ensures that internal consumers calling the module as a function (e.g., require('./log')(val)) continue to function without modification.

Verification

• Linting: Passed npm run lint with no issues.
• Automated Tests: Verified that test/config/load-logging.test.js passes, confirming that logging configuration remains intact.
• Manual Testing: Verified both the factory function and the class constructor directly to ensure output formatting, color support, and debug toggling work as expected.

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