Implement code structure for dynamic difficulty progression

[Tomjiang2421]

Develop codes for the dynamic difficulty scaling for enemy health and damage with player levels.

Requirement:

1. track player level status
2. equation for scalable enemy health and attack damage with player level status (for logic, reference balancing design file in the Google Drive folder)

[Tomjiang2421]

Issue placed on hold now because of the potential changes to the player level system and project scope. As we are hitting behind schedule, this system might be scraped to reduce scope.