[PLAT-3638] Wrapper for MonotonicityPreservingCubicSplineInterpolator
[PLAT-3641] Wrapper for NonnegativityOreservingCubicSplineInterpolator
[PLAT-3643] Wrapper for SemilocalCubicSplineInterpolator
[PLAT-3637] Wrapper for MonotoneConvexSplineInterpolator
[PLAT-3644] Wrapper for ShapePreservingCubicSplineInterpolator
[PLAT-3986] NonnegativityPreservingQuinticSplineInterpolator needs more
tests
[PLAT-3987] Clean up PiecewisePolynomialInterpolator1D