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

[Pranavchiku]

Description

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

double stdlib_base_coth( const double x );

Related Issues

#752 .

Questions

No.

Other

No.

Checklist

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

[lovelindhoni]

Hey @Pranavchiku @kgryte I would like to work on this issue :)

[Pranavchiku]

Thanks for your interest, assigned it to you.