Add integration of physical function

Walkthrough

The recent updates enhance the physical_function in splinepy for improved spline integration by introducing a spline parameter for greater clarity and usability. The function's logic is refined to handle various spline types and optimize performance using np.einsum. Additionally, a new test function validates the integration of a parabolic function over a rectangular domain, ensuring the implementation's correctness and robustness.

Changes

Files	Change Summary
`splinepy/helpme/integrate.py`	Updated `physical_function` to include a `spline` parameter, adding comprehensive parameter documentation and error handling. Enhanced internal logic for better integration handling.
`tests/helpme/test_integrate.py`	Added `test_physical_function_integration` to validate integration of a parabolic function over a defined rectangular domain, ensuring correctness of the integration logic with B-splines.

Poem

🐰 In a world of splines, oh what a delight,
With functions so clear, they shine ever bright.
Integrate with glee, let the numbers dance,
In the land of math, give new features a chance!
From parabolas bold, to knots that entwine,
Hooray for the changes, all perfectly fine! 🌟

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tataratat / splinepy