science/numsa: [NEW PORT] Solvent accessible surface area calculation

Numerical surface area integrator for molecular inputs. This project
is based on routines from xtb and dftb+.

WWW: https://github.com/grimme-lab/numsa/

Reviewed by: diizzy@
Approved by: yuri@ (Mentor)
Differential Revision: https://reviews.freebsd.org/D53529