feat: add C implementation for stats/base/ndarray/snanmaxabs

[AryanSharma48]

Part of #14034.

Description

What is the purpose of this pull request?

This pull request:

• adds the native C implementation for @stdlib/stats/base/ndarray/snanmaxabs.
• adds the Node-API boilerplate and tryRequire dispatcher to safely fall back to the pure JS implementation.
• includes the required C benchmarks, native JS benchmarks, and C examples mirroring the canonical structure.

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• Part of [RFC] : add C implementations for @stdlib/stats/base/ndarray packages (tracking issue) #14034

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.

AI Assistance

When authoring the changes proposed in this PR, did you use any kind of AI assistance?

• Yes
• No

If you answered "yes" above, how did you use AI assistance?

• Code generation (e.g., when writing an implementation or fixing a bug)
• Test/benchmark generation
• Documentation (including examples)
• Research and understanding

Disclosure

If you answered "yes" to using AI assistance, please provide a short disclosure indicating how you used AI assistance. This helps reviewers determine how much scrutiny to apply when reviewing your contribution.

I utilized AI assistance solely to help scaffold the repetitive test and benchmark boilerplate based on the snanmin reference package. The C implementation and native bindings were handled manually.

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@stdlib-js/reviewers

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/ndarray/snanmaxabs	$\\color{red}171/176$ $\\color{green}+0.00\\%$	$\\color{red}4/5$ $\\color{green}+0.00\\%$	$\\color{red}1/2$ $\\color{green}+0.00\\%$	$\\color{red}171/176$ $\\color{green}+0.00\\%$

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