feat: add blas/base/isamax

[aman-095]

Description

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/isamax is proposed.

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@stdlib-js/reviewers

[Pranavchiku]

This will be simple to review, I'll review this and idamax today evening ( IST )

[Pranavchiku]

Can you please iterate over changes made in idamax and see if this PR has anything to change?

[kgryte]

LGTM. Thanks, @aman-095.

Note that I had to make a number of small changes. So would be worthwhile on your side to do a file-by-file review to minimize typos, etc, in future PRs, especially when porting changes from one PR to another, as in the BLAS work.

[aman-095]

Sure, @kgryte will review all the files once before pushing. Thanks for reviewing and merging this PR.