feat: Integrate JSON:API Parsing Library (#14)

[msddev]

This merge request introduces JsonApiX JSON:API parsing library to enhance the robustness and maintainability of data handling within the application. By leveraging a specialized library, we eliminate the need for manual parsing and ensure compliance with JSON:API specifications, including relationships and included resources.

Key Changes:

• Integrated JsonApiX for JSON:API parsing.
• Refactored existing code to utilize the library for deserialization and serialization of JSON:API responses.
• Improved error handling and data consistency by relying on the library's built-in capabilities.
• Enhanced code readability and maintainability by reducing manual parsing logic.

Related Issue: #14