2d support for from_bevy_mesh

[Aceeri]

TODO:

• [ ] We need to somehow convert a TriMesh into a Polyline for convex decomposition. First thought is to filter edges to ones that only have 1 connecting triangle, then walking along those points, but I'm unsure how you would deal with topology issues. Other thought it modify the VHACD parameters to take in a 2d trimesh as well and shoehorn it into the 3d trimesh setup.