* feat: enhance PDF table extraction to support complex forms and add new test cases
* feat: enhance PDF table extraction with adaptive column clustering and add comprehensive test cases
* fix: correct formatting and improve assertions in PDF table tests
* Updated DocumentConverter interface
* Updated all DocumentConverter classes
* Added support for various new audio files.
* Updated sample plugin to new DocumentConverter interface.
* Updated project README with notes about changes, and use-cases.
* Updated DocumentConverter documentation.
* Move priority to outside DocumentConverter, allowing them to be reprioritized, and keeping the DocumentConverter interface simple.
---------
Co-authored-by: Kenny Zhang <kzhang678@gmail.com>
lesyk