metadata: Detailed Dataset Authorship Metadata (#8875)

Converter script can now read these two fields as a detailed base model and dataset source.
This was done so that it will be easier for Hugging Face to integrate detailed metadata as needed.

 -  base_model_sources (List[dict], optional)
 -  dataset_sources (List[dict], optional)

Dataset now represented as:

 - general.dataset.count
 - general.dataset.{id}.name
 - general.dataset.{id}.author
 - general.dataset.{id}.version
 - general.dataset.{id}.organization
 - general.dataset.{id}.description
 - general.dataset.{id}.url
 - general.dataset.{id}.doi
 - general.dataset.{id}.uuid
 - general.dataset.{id}.repo_url

This also adds to base model these metadata:

 - general.base_model.{id}.description