Compute an index masks of points to remove to simplify the curve attribute using the Ramer-Douglas-Peucker algorithm.
The Ramer-Douglas-Peucker algorithm finds a set of points in a polyline to remove so that the overall shape of the polyline is similar. How similar can be controlled by the distance `epsilon`.
The function takes a `GSpan` so it can be used with any attribute (that has a type `float`, `float2`, or `float3`).
Pull Request: https://projects.blender.org/blender/blender/pulls/118560
f8ef2b3e78