feat: Add PyPDFToDocument component (2.0)

[vblagoje]

Related issues

#5670

Why:

This PR introduces the PyPDFToDocument component to Haystack 2.0. This component is designed to convert PDF files into a list of Document objects, which can then be seamlessly integrated into the Haystack 2.0 pipeline.

What:

A new PyPDFToDocument component has been added to the file_converters package. This package serves as a collection of various file conversion utilities within Haystack.

How can it be used:

Here's a code snippet demonstrating how to use the new PyPDFToDocument component:

from haystack.preview.components.file_converters.pypdf import PyPDFToDocument

paths = [preview_samples_path / "pdf" / "react_paper.pdf"]
converter = PyPDFToDocument()
output = converter.run(paths=paths)
docs = output["documents"]
assert len(docs) == 1
assert "ReAct" in docs[0].text

How did you test it:

Unit tests have been added to cover the new component. Additionally, manual tests were conducted, as described in the "How can it be used" section above.

Notes For Reviewer:

Please ensure that the new component and its unit tests are correctly implemented. Double-check to make sure everything aligns with the project's standards and that there are no unintended side effects.

[ZanSara]

Great! 🚀

[vblagoje]

@Timoeller @ZanSara Inspired by the #4467 thread, perhaps we can adjust the default PyPDFToDocument impl to https://github.com/deepset-ai/haystack/tree/improved_pdf_to_document which would allow complete pdf to Document conversion customization without reinventing the wheel.