[CPR-2] Refactor custom price ranges plugin code for improved readability and maintainability

[brunosantoslab]

Summary:

This task involves refactoring the "Custom Price Ranges for WooCommerce" plugin code to improve readability, maintainability, and overall performance. The goal is to follow best practices and modularize the logic, making the plugin easier to extend and maintain in the future.

Changes:

• Modularization: Break down large functions into smaller, more manageable functions to improve code clarity and reusability.
• Code Duplication Reduction: Refactor repeated code blocks for saving and displaying prices to reduce redundancy.
• Performance Optimization: Improve performance by reducing unnecessary database queries and ensuring that price retrieval logic is efficient.
• Security Improvements: Ensure that all user inputs are properly sanitized and validated.
• Code Style: Align the code with WordPress coding standards and improve consistency in naming conventions and structure.

Impact:

• This refactor will make the code more modular and maintainable, reducing the likelihood of bugs and improving long-term scalability.
• The plugin will remain functional while being optimized for better performance and readability.

Testing:

• Ensure that all price display and saving functionalities continue to work correctly.
• Test the plugin's integration with WooCommerce to verify that the new structure doesn't impact existing functionality.

Please review the changes and approve the task for implementation.