client.go
func OptImportStatusChannel(statusChan chan<- ImportStatusUpdate) ImportOption {
	return func(options *ImportOptions) error {
		options.statusChan = statusChan
		return nil
	}
}
func OptImportStatusChannel(statusChan chan<- ImportStatusUpdate) ImportOption {
	return func(options *ImportOptions) error {
		options.statusChan = statusChan
		return nil
	}
}
// OptImportStatusChannel is a channel which carry import status information.
// Make sure to read from this channel, otherwise the import process will stall.