chore Use pdf library to check file without extension#184

yuming-long merged 7 commits intomainUnstructured-IO/unstructured-python-client:mainfrom

yuming/RUDOLPH-98_pdf_split_not_relay_on_file_extendUnstructured-IO/unstructured-python-client:yuming/RUDOLPH-98_pdf_split_not_relay_on_file_extendCopy head branch name to clipboard