feat: add blas/base/zaxpy

[aman-095]

Description

What is the purpose of this pull request?

This RFC proposes to add a routine to scale values of input complex double-precision floating-point vector by another complex double-precision floating-point constant and add the result to another complex double-precision floating-point vector as defined in BLAS Level 1 routines. Specifically adding @stdlib/blas/base/zaxpy is proposed.

Related Issues

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None.

Questions

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No.

Other

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No.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[kgryte]

@aman-095 Do you want to add the C/Fortran implementation to this package in this PR or would you prefer to get this merged and add the implementations in a separate PR?

[kgryte]

This looks good so far. Had to make a variety of clean-up changes, but I think we should be good in terms of the JS implementation.

[kgryte]

As discussed offline, this PR is good to merge. The Fortran implementation requires being able to link to Fortran deps, which we still need to sort out. Thanks, @aman-095!