feat: add accessor protocol and refactor stats/base/nanvariancepn

[rahulptl165]

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type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes. report:

• task: lint_filenames status: passed
• task: lint_editorconfig status: passed
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Resolves #5675 .

Description

This pull request:

• Adds new file lib/accessors.js.
• Modified lib/nansumpw.js.
• Modified lib/nanvariancepn.js.
• Modified lib/ndarray.js.
• Modified examples, benchmarks, docs, tests and readme files accordingly.

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves [RFC]: refactor and add protocol support to stats/base/nanvariancepn #5675

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.

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/nanvariancepn	$\color{green}549/549$ $\color{green}+100.00\%$	$\color{green}51/51$ $\color{green}+100.00\%$	$\color{green}4/4$ $\color{green}+100.00\%$	$\color{green}549/549$ $\color{green}+100.00\%$

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

[kgryte]

/stdlib merge

[gururaj1512]

/stdlib merge

[kgryte]

LGTM