[RFC]: add `blas/base/csscal`

[performant23]

Description

This RFC proposes adding the package @stdlib/blas/base/csscal for scaling a single-precision complex number by a real constant:

void csscal(const int N, const float alpha, void *X, const int strideX);

Related Issues

Related issues: #2039 (Tracker)

Questions

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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:.