feat: picture description via langchain llm

[dolfim-ibm]

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[github-actions]

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

[codecov]

Codecov Report

❌ Patch coverage is 0% with 41 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
langchain_docling/picture_description.py	0.00%	38 Missing ⚠️
langchain_docling/_plugins.py	0.00%	3 Missing ⚠️

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