Add fillet option to Curve to Tube modifier

I'm surely not the only person ever to need to model bent wire. Or bent pipe. Doing so almost always requires modeling fillets at bend corners.

GN can already fillet curves. (In fact, I've been using GN to do pipes with fillets for quite some time.) Now that there is a built-in Curve to Pipe modifier based on GN, it would be a much-welcome addition to allow said modifier to fillet corners as well.