recurse_symlinks equivalent for all python versions.

[BrianPugh]

Replace #151 with an equivalent that works with all python versions.

[Copilot]

Pull request overview

This PR replaces the use of Path.rglob() with the recurse_symlinks=True parameter (introduced in Python 3.13) with a custom _walk_all() function that works across all Python versions. The change ensures backward compatibility while maintaining the same functionality of recursively traversing directories and following symbolic links.

Changes:

• Added a new _walk_all() helper function that uses os.walk() with followlinks=True
• Replaced source.rglob("*", recurse_symlinks=True) with _walk_all(source)
• Added os import to support the new implementation

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[skrat]

Thank you