Update factories and parsers for new model and metadata types

[dwikler]

Title:
Update SpecFactory and DOMTableSpecParser for new model and metadata types

Description:

• Update SpecFactory and related code to instantiate the correct model class (TableSpecModel, SectionSpecModel, etc.) and pass the correct metadata type.
• Update DOMTableSpecParser to return the new metadata dataclass from parse_metadata.
• Update all usages and tests accordingly.