Improve retessellate performance#2
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This PR improves the performance of the retessellate function by sorting polygons by plane distance and only re-tesselating clusters with multiple coplanar polygons.
The current implementation checks each polygon against all existing groups, performing O(n^2) work in the worst case. By sorting and clustering polygons first, we can skip re-tesselating single polygon clusters and only do the expensive re-tesselation work on actual polygon groups.
On test geometries with ~15k polygons each, this change improved retessellate performance by 4-5x.
Resolves #1.