async findGroupCoordinator({ groupId, coordinatorType }) {
    // TODO: validate groupId, mandatory
    const findCoordinator = this.lookupRequest(apiKeys.GroupCoordinator, requests.GroupCoordinator)
    return await this[PRIVATE.SEND_REQUEST](findCoordinator({ groupId, coordinatorType }))
  }
@public
@param {object} request
@param {string} request.groupId The unique group id
@param {import("../protocol/coordinatorTypes").CoordinatorType} request.coordinatorType The type of coordinator to find
@returns {Promise}