- Added AdvancedPdfLoader class for enhanced PDF processing using the unstructured library.
- Integrated fallback mechanism to PyPdfLoader in case of unstructured library import failure or exceptions.
- Updated supported loaders to include AdvancedPdfLoader.
- Added unit tests for AdvancedPdfLoader to ensure functionality and error handling.
- Updated poetry.lock and pyproject.toml to include new dependencies and versions.
Signed-off-by: EricXiao <taoiaox@gmail.com>
