Taxonomy: multiple taxonomies per document type

New scope based on the changed use case and discussion with engineering on April 5 2023. 

• Multiple taxonomies per document type
• Enable multiple taxonomy assignment per document type in essentials
• Form taxonomy field as a “custom” field in document type editor 
• Enable extra taxonomy field addition in document typer editor in CMS
• Provide UI to admins/developers to select which taxonomy will be used in which field

• Show all added taxonomy fields in documents where the picker will open the taxonomy assigned to the specific field.

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Support multiple taxonomies in a taxonomy field configuration.
Maybe set taxonomy.names next to existing taxonomy.name

• Essentials to support this
• the taxonomy field is to show more information than just the category name: also the taxonomy name and possibly the categories inbetween
• the taxonomy picker would show all taxonomies in the same tree

Designs: https://www.figma.com/file/4GarFlrCpzKLtxTRNmbmiP/Taxonomy-plugin?node-id=112%3A2244&t=Yh83mT4HEtwkQ1Ym-1 

Old scope:
As an editor, I want to see all available taxonomies for a document type in the picker so that I can select the ones that I want to use in the same picker

Multiple taxonomies per document type

• Enable multiple taxonomies in the same “keys” field in document type in configuration
• Provide a UI to user where they can select which taxonomy to use in the picker
• Show user all the selected terms from different taxonomies in the picker