feat(string/base/concat): add string concatenation package

[farazghani]

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Resolves #{{TODO: add issue number}}.

Description

What is the purpose of this pull request?

This pull request:

• {{This pull request adds a new package:

@stdlib/string/base/concat

The package provides a minimal, fixed-arity string concatenation utility:

var concat = require( '@stdlib/string/base/concat' );
var out = concat( 'hello', 'world' );
// => 'helloworld'

This implementation intentionally mirrors the behavior and structure of other @stdlib/string/base/* utilities, such as lowercase and uppercase, but offers fixed-arity concatenation (two arguments only). A future package will address variadic string concatenation.}}

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• #{{feat: add string/base/concat #8544 feat: add string/base/concat #8521}}

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
• 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.".

{{I consulted chatpgt to verify my code that i wrote with reference to the module uppercase and lowercase}}

---

• Read, understood, and followed the contributing guidelines

@stdlib-js/reviewers

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Coverage Report

Package	Statements	Branches	Functions	Lines
string/base/concat	$\color{green}81/81$ $color{green}+100.00%$	$\color{green}3/3$ $color{green}+100.00%$	$\color{green}1/1$ $color{green}+100.00%$	$\color{green}81/81$ $color{green}+100.00%$

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

[kgryte]

Ref: #8521

[stdlib-bot]

Thank you for working on this pull request. However, we cannot accept your contribution as the issue this pull request seeks to resolve has already been addressed in a different pull request or commit.

Thank you again for your interest in stdlib, and we look forward to reviewing your future contributions.