feat(CLI): Option to download arbitrary HuggingFace model

[vku-ibm]

Added option to docling-tools cli to download arbitrary models from HuggingFace using repo id as identification. This is useful for pre-loading VLMs, in the same process where default models are pre-loaded.

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[dolfim-ibm]

nice!

[codecov]

Codecov Report

❌ Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
docling/cli/models.py	0.00%	11 Missing ⚠️

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[dosubot]

Documentation updates
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