feat: add marker to indicate typing support for Python package

[maxdswain]

Description
Add py.typed marker to indicate that the Python package supports typing as per PEP 561. This allow this package to be properly used in code bases that use type checkers such as mypy, pyright, pyrefly or ty.

Issue resolved by this Pull Request:
Resolves #674

Checklist:

• Documentation has been updated, if necessary.
• Examples have been added, if necessary.
• Tests have been added, if necessary.

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• python/opendataloader-pdf/src/opendataloader_pdf/py.typed

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• python/opendataloader-pdf/src/opendataloader_pdf/py.typed

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[maxdswain]

@bundolee can I get a review/this merged? It would greatly improve the experience for working with the package in typed projects.