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

[Neerajpathak07]

Resolves none

Description

What is the purpose of this pull request?

This pull request:

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

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

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/dsmeanpw	$\color{green}351/351$ $\color{green}+100.00\%$	$\color{green}18/18$ $\color{green}+100.00\%$	$\color{green}4/4$ $\color{green}+100.00\%$	$\color{green}351/351$ $\color{green}+100.00\%$

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

[Neerajpathak07]

/stdlib update-copyright-years

[stdlib-bot]

@Neerajpathak07, slash command not recognized. Please use /stdlib help to view available commands.

[kgryte]

Other than updating to use dssumpw explicitly, this PR looks good.

[kgryte]

LGTM