feat: add `blas/base/dznrm2`

[aman-095]

Description

What is the purpose of this pull request?

This RFC proposes to add a routine to find the euclidean norm of a complex double-precision floating-point vector as defined in BLAS Level 1 routines. Specifically adding @stdlib/blas/base/dznrm2 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.

• [x] Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[kgryte]

@aman-095 LMK when this PR is ready for review.

[aman-095]

Hey, @kgryte, I have added C and Fortran implementation to this.