Implement proper GPU dispatch of meshes

[waynemwashuma]

Objective

Changes the WebGL rendering system to use an event-driven architecture instead of component hooks for mesh GPU resource management.

Solution

The previous implementation used component hooks (meshAddHook2) which created tight coupling and immediate processing during component addition. This PR introduces a more robust event-driven system that:

• Adds a proper cleanup of GPU resources when meshes are dropped.
• Decouples mesh dispatching to gpu from immediate component addition on an entity.

Migration Guide

No external breaking changes.

Checklist

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• I have verified backward compatibility where possible.
• I have manually tested code works as intended.