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

[0PrashantYadav0]

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Resolves None.

Description

What is the purpose of this pull request?

This pull request:

• Updates native addon from C++ to C for stats/base/dsvariance

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves None.

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No.

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• Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dsvariance	$\color{green}363/363$ $\color{green}+100.00\%$	$\color{green}14/14$ $\color{green}+100.00\%$	$\color{green}4/4$ $\color{green}+100.00\%$	$\color{green}363/363$ $\color{green}+100.00\%$

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

[0PrashantYadav0]

@kgryte Please review this one as well.

[kgryte]

LGTM