feat(Doclang): add content layer support

[vagenas]

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[github-actions]

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[mergify]

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🔴 Require two reviewer for test updates

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

[codecov]

Codecov Report

❌ Patch coverage is 86.84211% with 5 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
docling_core/experimental/doclang.py	86.84%	5 Missing ⚠️

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