"Approximate NURBS Curve" node FreeCAD implementation

Created by: rendetto

This PR adds the PointsToBSpline OCCT method from FreeCAD for approximating points to a NURBS curve.

Example of Chord Length Parametrization:

Example of using Variational Smoothing:

EDIT: I added an option where we can specify the knots explicitly:

The cool thing here is that we can utilize the "Generate Knotvector" node and use the metrics from it.