feat: add stats/incr/nanpcorr2

[coehemang]

Resolves #5617.

Description

What is the purpose of this pull request?

This pull request:

• Adds the @stdlib/stats/incr/nanpcorr2 package, which computes a squared sample Pearson product-moment correlation coefficient incrementally while handling NaN values by ignoring them.

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves [RFC]: add stats/incr/nanpcorr2 #5617

Questions

Any questions for reviewers of this pull request?

No.

Other

Any other information relevant to this pull request? This may include screenshots, references, and/or implementation notes.

Modified test cases are passed





Examples generated after modifying index.ts under example





Benchmarks are passed

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-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/incr/nanpcorr2	$150/150$ $+100.00\mathrm{\%}$	$12/12$ $+100.00\mathrm{\%}$	$2/2$ $+100.00\mathrm{\%}$	$150/150$ $+100.00\mathrm{\%}$

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

[Planeshifter]

/stdlib update-copyright-years