Add simple Physics

[ollisco]

Simple Physics, including:

• Position
• Velocity
• Acceleration
• Colisions (Elastic and inelastic)

Features to implement before merging #25 into main

• Sphere - Sphere
• Box - Sphere
• Box - Box

Features to add later

• Raycast sphere
• Raycast box
• Friction
• Angular velocity
• ECS integration

Features that would be nice to have

• Convex mesh colliders
• Concave mesh colliders