Changes to List all knowledge for an Assistant

the knowledge/items/id response's property pattern was changed from ^aia_know_*$ to ^aia_know_.+$ for the status 200

added the optional property knowledge/items/embedding_model to the response with the 200 status

the response property knowledge/items/date_created became required for the status 200

the response property knowledge/items/date_updated became required for the status 200

the response property knowledge/items/id became required for the status 200

the response property knowledge/items/name became required for the status 200

the response property knowledge/items/type became required for the status 200

endpoint added