[RFC]: refactor `math/base/special/cexp` to follow latest project conventions

[aayush0325]

Description

This RFC proposes refactoring of math/base/special/cexp to use in house stdlib functions for operations like exp, sin, cos and copysign.

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Checklist

• I have read and understood the Code of Conduct.
• Searched for existing issues and pull requests.
• The issue name begins with RFC:.

[kgryte]

@aayush0325 Thanks for opening this issue. Yes, we should definitely update to use stdlib functions and also replace the usage of the INFINITY and NAN macros. For the former, we have a constant package. For the latter, we should just use 0.0 / 0.0.

[aayush0325]

@kgryte i have done just that in the pr linked to this issue!