RFC: add BLAS routine `idamax`

[kgryte]

Checklist

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

Description

Description of the feature request.

This RFC proposes to add a routine to find the index of the first element having maximum absolute value in a double-precision floating-point vector, as defined in BLAS Auxiliary. Specifically adding @stdlib/blas/base/idamax is proposed.

Related Issues

Does this feature request have any related issues?

No.

Questions

Any questions for reviewers?

No.

Other

Any other information relevant to this feature request? This may include screenshots, references, sample output, and/or implementation notes.

No.