refactor: update stats/base/dnanvariancetk native addon from C++ to C

[Neerajpathak07]

Resolves none.

Description

What is the purpose of this pull request?

This pull request:

• updates stats/base/dnanvariancetk native addon from C++ to C

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves none

Questions

Any questions for reviewers of this pull request?

No.

Other

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

No.

Checklist

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

• Read, understood, and followed the contributing guidelines

---

@stdlib-js/reviewers

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dnanvariancetk	$\color{green}427/427$ $\color{green}+100.00\%$	$\color{green}43/43$ $\color{green}+100.00\%$	$\color{green}4/4$ $\color{green}+100.00\%$	$\color{green}427/427$ $\color{green}+100.00\%$

The above coverage report was generated for the changes in this PR.

[kgryte]

LGTM.