Bounding Box Support for Curves with Generic Degree

[dorianprill]

Goal

Implement bounding_box() method for the generic Bezier and BSpline curve types.

Problem

Computing the bounding box requires finding the extrema of a polynomial/curve of degree N, which translates to finding roots of a spline curve of degree N-1. For higher order curves (d > 4) this requires implementing the newton-raphson root finding algorithm.
This may be difficult to do generically for both curve types in a const generic setting because some instability around the Fn-family traits.

It is already implemented with tinyvec::ArrayVec for the specialized types QuadraticBezier and Cubic Bezier where N is fixed.