feat: support v, d flags

[aheckmann]

No description provided.

[Copilot]

Pull Request Overview

This PR adds support for the v (unicodeSets) and d (hasIndices) regex flags to the regexp-clone library. These are newer ECMAScript regex features that allow for enhanced Unicode support and capture group indices tracking.

• Adds support for the v flag (unicodeSets) and d flag (hasIndices) in the main cloning logic
• Updates test suite to include comprehensive coverage for both new flags
• Modifies existing test helpers to accommodate the new unicode-related flags

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
index.js	Adds detection and preservation of v and d flags in the regex cloning process
test/index.js	Adds test coverage for both new flags and updates existing test helpers to handle unicode flag variations

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