Add intrinsic triangulation to CSG

[fire]

Make a program through godot-sandbox that takes existing CSG and transforms them so that the topology is better, and long, thin triangles become evenly distributed triangles.

I had this tooling for manifold meshes that can give the equal triangle size measure: https://github.com/V-Sekai/TOOL_intrinsic_triangulations

Initial

Improved

[fire]

We must first design the API to fit the 3d conversion use case.

[fire]

class CSGIntrinsicTriangulation3D : public CSGShape3D {
	GDCLASS(CSGCombiner3D, CSGShape3D);

private:
	virtual CSGBrush *_build_brush() override;

public:
	CSGIntrinsicTriangulation3D();
};