feat: add symbol/search

[DivyanshuVortex]

Resolves #8480

Description

This PR implements the RFC for adding the package assert/has-split-symbol-support.

The package is modeled after existing ones:

• assert/has-iterator-symbol-support
• assert/has-is-concat-spreadable-symbol-support
• assert/has-has-instance-symbol-support

The only functional difference is that this package checks for the existence of Symbol.split.

Implementation steps completed

• Copied assert/has-iterator-symbol-support
• Renamed all identifiers and references from iterator → split
• Updated logic to detect Symbol.split
• Verified correctness with local tests, examples, and benchmarks

Related Issues

None.

Questions

No.

Other

No.

Checklist

• Read, understood, and followed the contributing guidelines.

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AI Assistance

• Yes
• No

How AI was used

• Research and understanding
• Documentation (including examples)

Disclosure

Used ChatGPT to understand structure the PR description.
All code edits and verification were performed manually.

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@stdlib-js/reviewers

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
symbol/search	$\color{green}107/107$ $color{green}+100.00%$	$\color{red}2/3$ $color{green}+66.67%$	$\color{green}0/0$ $color{green}+100.00%$	$\color{green}107/107$ $color{green}+100.00%$

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