This adds basic PDF support (using our existing `parse_pdf` function)
to the file_search tool and corresponding Vector Files API.
When a PDF file is uploaded and attached to a vector store, we parse
the pdf and then chunk its content as normal. This is not the best
solution long-term, but it does match what we've been doing so far for
PDF files in the memory tool.
Signed-off-by: Ben Browning <bbrownin@redhat.com>
