feat: add `math/base/special/acoshf`

[JavaTypedScript]

Progresses #649 .

Description

What is the purpose of this pull request?

This pull request:

• Adds c-implementation to acoshf in @stdlib/math/base/special

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• Progresses #649

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.

• [x] 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
• [x] 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. Example disclosures: "This PR was written primarily by Claude Code." or "I consulted ChatGPT to understand the codebase, but the proposed changes were fully authored manually by myself.".

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Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/acoshf	$\color{red}211/213$ $\color{green}+0.00%$	$\color{red}17/19$ $\color{green}+0.00%$	$\color{green}2/2$ $\color{green}+0.00%$	$\color{red}211/213$ $\color{green}+0.00%$

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