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

[aayush0325]

Resolves None

Description

What is the purpose of this pull request?

This pull request:

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

Related Issues

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This pull request:

• resolves None

Questions

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No.

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• Read, understood, and followed the contributing guidelines.

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Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dmeanwd	$\color{green}395/395$ $\color{green}+100.00\%$	$\color{green}20/20$ $\color{green}+100.00\%$	$\color{green}4/4$ $\color{green}+100.00\%$	$\color{green}395/395$ $\color{green}+100.00\%$

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

[aayush0325]

for the reviewer: i've changed the position of the algorithm description in main.c to be above the ndarray interface as that is where it is being implemented and i thought it would be more appropriate. if this needs to be changed kindly let me know!

[aayush0325]

i've changed the position of the algorithm description in main.c

changing this back as i see that merged PRs related to this are not changing it