feat(CLI): Option to download arbitrary HuggingFace model (#2123)

* Added option to docling-tools to download arbitrary HuggingFace model

Signed-off-by: Viktor Kuropiatnyk <vku@zurich.ibm.com>

* Added note in documentation

Signed-off-by: Viktor Kuropiatnyk <vku@zurich.ibm.com>

* Removed note on custom artifact path usage from HF download option

Signed-off-by: Viktor Kuropiatnyk <vku@zurich.ibm.com>

* Fixed typo

Signed-off-by: Viktor Kuropiatnyk <vku@zurich.ibm.com>

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Signed-off-by: Viktor Kuropiatnyk <vku@zurich.ibm.com>