feat: add ndarray/base/unary-reduce-subarray-by

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Description

What is the purpose of this pull request?

This pull request:

• adds ndarray/base/unary-reduce-subarray-by

Related Issues

Does this pull request have any related issues?

This pull request:

• progresses [RFC]: achieve ndarray API parity with built-in JavaScript arrays  #2656

Questions

Any questions for reviewers of this pull request?

Apart from the options parameter, should we have benchmarks for each kernel and order type?
Also, in the test.ts file I imported everyBy for the fcn Is that okay?

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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Coverage Report

Package	Statements	Branches	Functions	Lines
ndarray/base/unary-reduce-subarray-by	$\color{red}6423/12447$ $\color{green}+51.60\%$	$\color{green}50/50$ $\color{green}+100.00\%$	$\color{red}0/49$ $\color{green}+0.00\%$	$\color{red}6423/12447$ $\color{green}+51.60\%$

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

[stdlib-bot]

PR Commit Message

feat: add `ndarray/base/unary-reduce-subarray-by`

PR-URL: https://github.com/stdlib-js/stdlib/pull/7008
Ref: https://github.com/stdlib-js/stdlib/issues/2656

Co-authored-by: Athan Reines <kgryte@gmail.com>
Reviewed-by: Athan Reines <kgryte@gmail.com>

Please review the above commit message and make any necessary adjustments.