Allow to "mute" the output of the Kafka topic creation command

[ppatierno]

The rhoas kafka topic create allows to specify the output of the command as YAML and JSON.
I was thinking that sometimes for automated tasks and avoid to pollute the console could be useful to "mute" the output, exiting ok if the topic was creating but without printing any representation of the topic info. Maybe an --output none could be enough.

[wtrocki]

I think we might only print one sentence for topic by default. Or use some output as suggested

As workarounds for now we offer users to use std and error stream pipes.

rhoas kafka topic create --name=test /
 -y -o=json 1> /dev/null

I think we should also document this as it is not obvious pattern: It will still show errors or other messages but ignore often large standard output