feat: enrichment steps on all convert pipelines (incl docx, html, etc)

[dolfim-ibm]

This PR refactors the pipelines to allow the enrichment on "standard items" for all pipeline. It enables to run picture classification and description on the embedded images for MS Word and HTML documents.

Actual changes:

1. Move artifacts_path to the base pipeline_options and class --> remove redundant code from other pipelines.
2. Add ConvertPipeline which has options to enable the common enrich steps
3. Fix the enrich model base class to allow the case of embedded images in PictureItem without the page images.

Checklist:

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

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Related Documentation

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[PeterStaar-IBM]

lgtm!

[codecov]

Codecov Report

❌ Patch coverage is 72.72727% with 21 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
docling/models/base_model.py	33.33%	8 Missing ⚠️
docling/pipeline/base_extraction_pipeline.py	41.66%	7 Missing ⚠️
docling/pipeline/base_pipeline.py	82.75%	5 Missing ⚠️
docling/cli/main.py	66.66%	1 Missing ⚠️

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[cau-git]

LGTM

[ceberam]

🚀

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Documentation Updates

Checked 2 published document(s). No updates required.

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