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

[Vinit-Pandit]

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Resolves #{{TODO: add issue number}}.

Description

What is the purpose of this pull request?

This pull request:

• update stats/base/svariancepn native addon from C++ to C

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves #{{TODO: add issue number}}

Questions

Any questions for reviewers of this pull request?

No.

Other

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No.

Checklist

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

• 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/svariancepn	$\color{green}443/443$ $\color{green}+100.00\%$	$\color{green}33/33$ $\color{green}+100.00\%$	$\color{green}4/4$ $\color{green}+100.00\%$	$\color{green}443/443$ $\color{green}+100.00\%$

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

[kgryte]

LGTM.