feat: add blas/base/igamax

[aman-095]

Description

What is the purpose of this pull request?

This RFC proposes to add a routine to find the index of the first element having maximum absolute value as defined in BLAS Level 1 routines. Specifically adding @stdlib/blas/base/igamax is proposed.

Related Issues

None.

Questions

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No.

Other

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No.

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• Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[aman-095]

I explored and added the implementation for the generic routine of idamax. Once idamax and isamax are reviewed and merged, this can also be reviewed.

[kgryte]

@aman-095 You'll want to update this PR to handle accessor arrays (see gcopy and gswap), which will include updating the implementation and adding associated tests. In order to handle complex number arrays, we'll need to implement dcabs1 and scabs1 (as in izamax and icamax).

[aman-095]

Sure @kgryte I am currently working on cscal, and after this, I will start working on this as well.