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

[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/dnanvariancech
• refactors JavaScript implementation
• updates tests, docs, examples and benchmarks

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves None.

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• Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[0PrashantYadav0]

@aayush0325 Will you provide a quick review for this one as well. Thank you.

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dnanvariancech	$\color{green}422/422$ $\color{green}+100.00\%$	$\color{green}32/32$ $\color{green}+100.00\%$	$\color{green}4/4$ $\color{green}+100.00\%$	$\color{green}422/422$ $\color{green}+100.00\%$

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

[Neerajpathak07]

Suggested change

	Computes the [variance][variance] of a double-precision floating-point strided array `x` ignoring `NaN` values and using a one-pass trial mean algorithm.
	Computes the [variance][variance] of a double-precision floating-point strided array ignoring `NaN` values and using a one-pass trial mean algorithm.

[Neerajpathak07]

Suggested change

	const double x[] = { 1.0, -2.0, 0.0/0.0, 2.0 };
	const double x[] = { 1.0, 2.0, 0.0/0.0, 3.0, 0.0/0.0, 4.0, 5.0, 6.0, 0.0/0.0, 7.0, 8.0, 0.0/0.0 };

since these values come directly from example.c

[Neerajpathak07]

Suggested change

	double v = stdlib_strided_dnanvariancech( 4, 1.0, x, 1 );
	double v = stdlib_strided_dnanvariancech( 6, 1.0, x, 2 );

[Neerajpathak07]

You'll have to compute the return value for the new const x[] array.
You can also take help of repl for finding the value.

[Neerajpathak07]

Same goes for this as well.

[Neerajpathak07]

not sure if you need to change this.

[Neerajpathak07]

@0PrashantYadav0 Hey just a few comments similar to one of your previous PR. Also would you please look for these changes in your other PR's as well.