feat: add C ndarray interface and refactor implementation for stats/base/dsvariancepn

[0PrashantYadav0]

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Resolves None.

Description

What is the purpose of this pull request?

This pull request:

• adds C ndarray interface for stats/base/dsvariancepn
• refactors JavaScript implementation
• updates tests, docs, examples and benchmarks

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves None.

Questions

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No.

Other

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No.

Checklist

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• Read, understood, and followed the contributing guidelines.

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dsvariancepn	$\color{green}395/395$ $\color{green}+100.00\%$	$\color{green}21/21$ $\color{green}+100.00\%$	$\color{green}4/4$ $\color{green}+100.00\%$	$\color{green}395/395$ $\color{green}+100.00\%$

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

[aayush0325]

thanks for the clean PR!

[0PrashantYadav0]

@kgryte Please review and merge this pr.

[kgryte]

LGTM