interpax: JAX friendly interpolation & splines

[f0uriest]

Following the recent JEP I decided to package up some interpolation and spline routines I had written for other projects into interpax.

I'm hoping to build it out a bit more to cover more of the functionality from scipy.interpolate, I currently have linear and cubic interpolation in 1,2, and 3 dimensions, as well as Fourier interpolation in 1d and 2d. Next planned steps are N-D interpolators (both iterated splines and RBF), suggestions or contributions welcome!

[f0uriest]

I also have some stuff along the lines of scipy.integrate.quad that I'll hopefully be packaging up soon as well.