add support for analytical integration of some interpolations #100
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DataInterpolations already has support for computing the analytical derivative at any given point. This PR is a first step towards providing the same for integration.
I've computed the analytical integrals of the interpolation functions with an ungodly mix of Symbolics, Sympy, and copy-pasting, since Symbolics does not yet have a heuristic symbolical integration package like Sympy does, so was only used to extract the equations from the existing code.
This PR only adds integrals for a subset of the supported interpolations that seemed useful and easy to do. A future PR could extend this to more interpolations, but first I'll go back and put this functionality through its paces in CedarWaves.