[FEAT]: Add beast evolution logic

[coxmars]

Issue

Implement Beast Evolution System

Description

We need to implement a complete beast evolution system that allows beasts to evolve into different forms or stages based on specific criteria such as age, stats, items, or player actions. This will add depth to the gameplay and provide long-term progression goals.

Explanation

The beast evolution system will be a major feature that enhances the game's progression mechanics. This system needs to handle evolution triggers, transformations, stat changes, and visual/mechanical updates when beasts evolve.

Technical Spike Goals:

• Design evolution criteria and trigger conditions (age, stats, items, etc.)
• Create evolution tree/path system for different beast types
• Implement evolution validation and execution methods
• Add evolved beast stat calculation and property updates
• Implement evolution rewards and special abilities for evolved beasts
• Create comprehensive tests for all evolution scenarios and edge cases