New port: math/sundials: SUite of Nonlinear and DIfferential/ALgebraic Equation Solvers

This port was originally created by Pedro Giffuni. He offered me to take over it.
I updated it to 3.1.0, added many options, etc.

The option FCMIX is broken upstream, so it is not present in the port.

Approved by: adamw (mentor)
Differential Revision: https://reviews.freebsd.org/D13647