Changes to Create knowledge

changed the pattern of the request property assistant_id from ^aia_asst_*$ to ^aia_asst_.+$

changed the pattern of the request property policy/id from ^aia_plcy_*$ to ^aia_plcy_.+$

the id response's property pattern was changed from ^aia_know_*$ to ^aia_know_.+$ for the status 201

added the new optional request property embedding_model

added the optional property embedding_model to the response with the 201 status

the response property date_created became required for the status 201

the response property date_updated became required for the status 201

the response property id became required for the status 201

the response property name became required for the status 201

the response property type became required for the status 201

added the optional property url to the response with the 201 status