This pull request adds the optional -transport.kafka.scram flag,
which tells the Kafka transport to use SASL/SCRAM for authentication.
This allows goflow2 to work with AWS Managed Service for Kafka (MSK)
which does not support SASL/PLAIN.
Co-authored-by: Brian Landers <brian.landers@meraki.net>
Co-authored-by: lspgn <lspgn@users.noreply.github.com>