Add Bernstein polynomials

[mmikhasenko]

Bernstein.jl exists. The question is where the interface belongs,

• in Polynomials.jl with Extensions, or
• in Bernstein.jl, Missing interface from Polynomials.jl eschnett/Bernstein.jl#4

?

[jverzani]

There is an implementation in SpecialPolynomials. I wonder if the one in Bernstein.jl is more performant or has other benefits.

[mmikhasenko]

Found it
https://jverzani.github.io/SpecialPolynomials.jl/dev/#SpecialPolynomials.Bernstein

Good to know, I will look if it's easy to adopt.

The point of Bernstein.jl as I understood is multidimensional manifolds