Changes to Import items in bulk

the import/id response's property type changed from integer to string for status 200

added the new geoset enum value to the import/type response property for the response status 200

added the new start enum value to the import/state response property for the response status 200

added subschema #5: geoset to the import request property oneOf list

added the optional property import/geoset_id to the response with the 200 status

added the optional property import/geoset_mode to the response with the 200 status

added the media type application/json for the response with the status 429