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Add numerical tests for assoc_legendre with non-integer args

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#### References to other Issues or PRs Fixes #15795 #### Brief description of what is fixed or changed This PR adds tests to verify the numerical evaluation of the assoc_legendre...

Add PIDController class to sympy.physics.control module

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#### References to other Issues or PRs Fixes: #26163 #### Brief description of what is fixed or changed Introduced a PIDController class in the control module to simplify the creation...

Implement asymptotic series expansion of Ci(x) at -oo

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#### References to other Issues or PRs Fixes #26207 #### Brief description of what is fixed or changed Implemented the asymptotic series expansion for the Cosine Integral function Ci(x) at...