Returns the list of plannable user lists with their plannable status. User lists may not be plannable for a number of reasons, including: - They are less than 10 days old. - They have a membership lifespan that is less than 30 days - They have less than 10,000 or more than 700,000 users. List of thrown errors: AuthenticationError AuthorizationError FieldError HeaderError InternalError QuotaError RangeError ReachPlanError RequestError