WIP feat: accept binary PDF instead of just path to PDF

[aguadoenzo]

While the library expects a filepath to be given to the PdfConverter, the underlying pdfium.PdfDocument constructor supports bytes and other types. Adding 'bytes' as an accepted type for the Document Pydantic model allows binary PDFs to be parsed by the library.

I've tested this patch manually and things seem to work fine so far, but I'd prefer to add tests for it. However the test suite seems to be heavily built around creating a temporary file, and I'm not sure where to start to test this

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[aguadoenzo]

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[AGenchev]

Shouldn't this be made by creating a new provider e.g. binary_data provider, cv2_image provider ?

[mauryaland]

Up, this feature could be very useful !