Performance optimizations.

Add support for PHP 8.3.

Add FIX_DUPLICATE_STYLES option to modify() to remove duplicate <styl…

…e> tags.

Add PHP 8.2 support.

Update docblocks.

Add comment.

Update composer.json

Update Test.php

The library now works the same way as DomDocument when loadHTML() is …

…not called.

Fix conflicting internal string (breaks matching the html tag)