Node for Curves to extrude a new point

Video of what I mean by "extrude":

This can be done right now, but the process isn't very straightforward. You have to:

• capture any attributes you want to keep (tilt, radius, normal)
• convert the curve into a mesh with Curve to Mesh
• perform the extrude on the mesh points
• convert back with Mesh to Curve
• apply all the attributes back to the mesh

This is the basic version. I didn't even think about curve types, curve handle positions, custom attributes that will be lost in the conversion, the performance hit of doing the mesh conversions back and forth...

A dedicated node is needed for this.