feat: add accessor array support and refactor stats/base/nanmeanpn

[rahulptl165]

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Resolves #5657 .

Description

What is the purpose of this pull request?

This pull request:

• Adds accessor array protocol in stats/base/nanmeanpn

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves [RFC]: refactor and add protocol support to stats/base/nanmeanpn #5657

Questions

Any questions for reviewers of this pull request?

No.

Other

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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-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/nanmeanpn	$364/364$ $+100.00\mathrm{\%}$	$33/33$ $+100.00\mathrm{\%}$	$3/3$ $+100.00\mathrm{\%}$	$364/364$ $+100.00\mathrm{\%}$

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

[kgryte]

@rahulptl165 Based on the test coverage report above, looks like you are missing a couple of tests necessary to get 100% code coverage. This should be a simple matter of copy-pasting existing tests for indexed arrays and modifying to use accessor arrays.

[rahulptl165]

Hi @kgryte, I have addressed the missing test case issue. now this PR is ready for review.