feat: add stats/incr/nanmmean

[satansin123]

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Resolves #5588.

Description

What is the purpose of this pull request?

This pull request:

• Adds the @stdlib/stats/incr/nanmmean package, which computes an incremental mean while handling NaN values by skipping them.

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves [RFC]: add stats/incr/nanmmean #5588

Questions

Any questions for reviewers of this pull request?

No.

Other

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test -

benchmark -

examples -

Checklist

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

• Read, understood, and followed the contributing guidelines.

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Coverage Report

Package	Statements	Branches	Functions	Lines
stats/incr/nanmmean	$\color{green}182/182$ $\color{green}+100.00\%$	$\color{green}14/14$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}182/182$ $\color{green}+100.00\%$

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

[ShabiShett07]

Suggested change

	Returns an accumulator `function` which incrementally computes a moving [arithmetic mean][arithmetic-mean]. The `window` parameter defines the number of values over which to compute the moving mean.
	Returns an accumulator function which incrementally computes a moving [arithmetic mean][arithmetic-mean], ignoring `NaN` values.. The `window` parameter defines the number of values over which to compute the moving mean.

[ShabiShett07]

Suggested change

	var randu = require( '@stdlib/random/base/randu' );
	var incrnanmmean = require( '@stdlib/stats/incr/nanmmean' );
	var accumulator;
	var v;
	var i;
	// Initialize an accumulator:
	accumulator = incrnanmmean( 5 );
	// For each simulated datum, update the moving mean...
	for ( i = 0; i < 100; i++ ) {
	if ( randu() < 0.2 ) {
	v = NaN;
	} else {
	v = randu() * 100.0;
	}
	accumulator( v );
	var uniform = require( '@stdlib/random/base/uniform' );
	var bernoulli = require( '@stdlib/random/base/bernoulli' );
	var incrnanmmean = require( '@stdlib/stats/incr/nanmmean' );
	// Initialize an accumulator:
	var accumulator = incrnanmmean( 5 );
	// For each simulated datum, update the moving mean...
	var I;
	for ( i = 0; i < 100; i++ ) {
	accumulator( ( bernoulli( 0.8 ) < 1 ) ? NaN : uniform( 0.0, 100.0 ) );

[ShabiShett07]

Suggested change

var randu = require( '@stdlib/random/base/randu' );

[ShabiShett07]

We will be using iterations as the input

[ShabiShett07]

Suggested change

	v = acc( randu() );
	v = acc( i );

[ShabiShett07]

same as mentioned in the markdown file

[ShabiShett07]

Suggested change

	var incrnanmmean = require( '@stdlib/stats/incr/nanmmean/lib' );
	var incrnanmmean = require( './../lib' );

[ShabiShett07]

@satansin123, the PR looks good, left some comments to make some changes