feat: Add PaddleOCR-VL document converter

[Bobholamovic]

Related Issues

Proposed Changes:

This is a new feature that adds the official PaddleOCR integration for Haystack, providing a PaddleOCR-VL document converter component. The component leverages PaddleOCR's API for document parsing and supports text extraction from both PDF and image files.

How did you test it?

This PR includes a complete unit test suite including initialization tests, parameter validation, file type inference, API call tests, etc. Tests cover PDF and image file processing.

Notes for the reviewer

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.

[CLAassistant]

All committers have signed the CLA.

[anakin87]

Hey... thanks for the implementation!

I created #2569 to track the work to be done.

I don't think that I will be able to review this PR in detail soon, but in the meantime, please add a CI workflow similar to https://github.com/deepset-ai/haystack-core-integrations/blob/main/.github/workflows/anthropic.yml to make sure that tests run in the CI.

[Bobholamovic]

Hey... thanks for the implementation!

I created #2569 to track the work to be done.

I don't think that I will be able to review this PR in detail soon, but in the meantime, please add a CI workflow similar to https://github.com/deepset-ai/haystack-core-integrations/blob/main/.github/workflows/anthropic.yml to make sure that tests run in the CI.

Thanks. The CI workflow has been added.