[RFC]: Add C implementation for `@stdlib/math/base/special/asech`

[Pranavchiku]

Description

This RFC proposes adding C implementation for @stdlib/math/base/special/asech.

double stdlib_math_asech( const double x );

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