feat: add stats/base/ndarray/meankbn

[Harsh-Mathur-1503]

Resolves #8095

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Description

What is the purpose of this pull request?

This PR adds a new package @stdlib/stats/base/ndarray/meankbn,
which computes the arithmetic mean of a one-dimensional ndarray
using the improved Kahan–Babuška algorithm.

This pull request:

• Adds a new package @stdlib/stats/base/ndarray/meankbn
• Computes the arithmetic mean of a one-dimensional ndarray using the improved Kahan–Babuška algorithm
• Mirrors the API of @stdlib/stats/base/ndarray/mean but uses the improved Kahan–Babuška algorithm
• Includes fully implemented examples, tests, benchmarks, and TypeScript declarations

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves [RFC]: add stats/base/ndarray/meankbn #8095

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/ndarray/meankbn	$\color{green}89/89$ $\color{green}+100.00\%$	$\color{green}5/5$ $\color{green}+100.00\%$	$\color{green}1/1$ $\color{green}+100.00\%$	$\color{green}89/89$ $\color{green}+100.00\%$

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

[Harsh-Mathur-1503]

@kgryte May i know what changes are required so that this PR can be accepted ?

[gururaj1512]

Refer to the lib folder of stats/base/ndarray/mean. Use a similar implementation to stats/base/ndarray/mean and just update imports and docs according to meankbn.