feat: Factory and plugin-capability for Layout and Table models

[cau-git]

Checklist:

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

[mergify]

Merge Protections

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Make sure that we follow https://www.conventionalcommits.org/en/v1.0.0/

• title ~= ^(fix|feat|docs|style|refactor|perf|test|build|ci|chore|revert)(?:\(.+\))?(!)?:

[github-actions]

✅ DCO Check Passed

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[codecov]

Codecov Report

❌ Patch coverage is 91.46341% with 14 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
docling/models/table_structure_model.py	90.00%	6 Missing ⚠️
docling/pipeline/legacy_standard_pdf_pipeline.py	0.00%	5 Missing ⚠️
docling/models/layout_model.py	81.25%	3 Missing ⚠️

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