[RFC]: add C implementation for `math/base/special/binomcoef`

[gunjjoshi]

Description

This RFC proposes adding C implementation for math/base/special/binomcoef.

double stdlib_base_binomcoef( const double n, const double k );

Related Issues

Related issues #649.

Questions

No.

Other

No.

Checklist

• [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:.

[gunjjoshi]

I'd like to work on this.