feat: model and serializer for audio tracks

[ceberam]

This PR introduces a new type of provenance object for media files.

• ProvenanceTrack for media tracks
• Refactoring of other classes for provenance type check
• Utility classes and methods in a new module on WebVTT for reuse
• For testing the integration with docling, check the draft PR refactor: webvtt and provenance tracker (WIP) docling#2787

It also resolves docling-project/docling#2525

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[codecov]

Codecov Report

❌ Patch coverage is 93.03621% with 25 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
docling_core/types/doc/webvtt.py	92.40%	23 Missing ⚠️
docling_core/transforms/serializer/azure.py	83.33%	1 Missing ⚠️
...core/transforms/visualizer/key_value_visualizer.py	50.00%	1 Missing ⚠️

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Related Documentation

Checked 7 published document(s) in 1 knowledge base(s). No updates required.

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