Integration over a subdomain of a Tabulated1D

[HunterBelanger]

These changes add the functionality to perform a definite integral over a sub-range of a Tabulated1D function. As part of this work, I also added some static method to replace the old interpolation/integration logic, so that they could be more easily reused in different use cases.

There was already a Tabulated1D.integral method, but it returned a tabulation of the cumulative integral at all points, but this does not allow one to reconstruct the true curvature of the integral between tabulated points according to the interpolation rule. This new method facilitates this more easily.

[paulromano]

Thanks @HunterBelanger and sorry for the delay! I made a few updates:

• Corrected the linear-log antiderivative by including the missing interval-width factor in the constant term
• Reworked log-linear integration to handle constant segments without producing NaN and using expm1 for numerical stability.
• Added the logarithmic limiting form for log-log interpolation when the exponent is -1, avoiding division by zero.
• Fixed clipped integration ranges that lie entirely outside the tabulated domain so they return zero instead of integrating backward.