refactor: organize models in submodules

[dolfim-ibm]

This PR is an initial refactoring (in a non-breaking way) of the stages and models, before we introduce the concept of modular model runtime (e.g. transformers, mlx, api-based, onnx, etc).

Checklist:

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

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

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...erimental/pipeline/threaded_layout_vlm_pipeline.py	0.00%	5 Missing ⚠️
docling/pipeline/vlm_pipeline.py	75.00%	1 Missing ⚠️

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[PeterStaar-IBM]

great!

[dosubot]

Related Documentation

Checked 7 published document(s) in 0 knowledge base(s). No updates required.

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