Merge remote-tracking branch 'origin/pprados/pdf_loaders' into pprados/pdf_loaders

# Conflicts:
#	docs/docs/integrations/document_loaders/pdfminer.ipynb
#	docs/docs/integrations/document_loaders/pdfplumber.ipynb
#	docs/docs/integrations/document_loaders/pymupdf.ipynb
#	docs/docs/integrations/document_loaders/pypdfdirectory.ipynb
#	docs/docs/integrations/document_loaders/pypdfium2.ipynb
#	docs/docs/integrations/document_loaders/pypdfloader.ipynb
#	libs/community/langchain_community/document_loaders/parsers/pdf.py
#	libs/community/tests/integration_tests/document_loaders/parsers/test_pdf_parsers.py
#	libs/community/tests/integration_tests/document_loaders/test_pdf.py

Author: pprados