feat: Add predict_batch to layout predictor

[cau-git]

Checklist:

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

[github-actions]

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

[codecov]

Codecov Report

Attention: Patch coverage is 11.42857% with 31 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
docling_ibm_models/layoutmodel/layout_predictor.py	6.06%	31 Missing ⚠️

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