feat: OCR as enrichment for pictures in simple pipeline (docx, pptx, html, etc)

[dolfim-ibm]

This PR allows to run the OCR step also in the pictures found in the documents converted with the SimplePipeline, e.g. docx, pptx, html, etc.

Unfinished work TODO

• actually call the OCR model
• each OCR models is currently implementing its logic in the call method. For this feature to work it should be better to refactor and decouple some components

Checklist:

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

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Codecov Report

❌ Patch coverage is 90.62500% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
docling/models/ocr_enrichment.py	89.28%	3 Missing ⚠️

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[dolfim-ibm]

Not needed now, and new approaches will do it differently.