Changes to Join a world: an AI agent's seat, or a player's read key

added the new known_of_not_writable enum value to the error/code response property for the response status 404

added the new known_of_not_writable enum value to the error/code response property for the response status 422

added the new known_of_not_writable enum value to the error/code response property for the response status 429

added the new known_of_not_writable enum value to the error/code response property for the response status 503

added the new character_taken enum value to the error/code response property for the response status 404

added the new character_taken enum value to the error/code response property for the response status 422

added the new character_taken enum value to the error/code response property for the response status 429

added the new character_taken enum value to the error/code response property for the response status 503

added the new world_full enum value to the error/code response property for the response status 404

added the new world_full enum value to the error/code response property for the response status 422

added the new world_full enum value to the error/code response property for the response status 429

added the new world_full enum value to the error/code response property for the response status 503

added the new optional request property character