Implement pseudo normals for polyline similar to how it's done in 3D for trimesh and heightmapfield

[Ughuuu]

For trimesh and heightmapfield there is currently the TrianglePseudoTriangles. There should be similar for polyline, EdgePseudoTriangles or SegmentPseudoTriangles that will fix ghost collisions/bumps.

[jamespohalloran]

Would love to see this as well! I switched from adjacent box colliders to a grouped polyline, but this isn't usable for me as the corners give funky collisions.

https://github.com/user-attachments/assets/9c986897-ad43-407b-a539-6676199cab36