feat(ocr): Integrating PaddleOCR in Docling

[Swaymaw]

Add a description of the changes:

1. Files Changed: a. datamodel/pipeline_options.py - Included Options for PaddleOCR framework. b. models/paddle_ocr_model.py - Added processing steps to compute and post process paddle_ocr results using the original docling flow. c. pipeline/standard_pdf_pipeline.py - Added condition for PaddleOCROptions inside the get_ocr_model function to get the ocr model whenever requested using pipeline options.

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Checklist:

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

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