Add the ability to view a consumer group

[craicoverflow]

Description

Add a command to view a consumer group by its ID in the current Kafka instance.

$ rhoas kafka consumer-group <name> describe

[rkpattnaik780]

For this functionality, should we display the consumers in a tabular format, apart from traditional yaml and json that we use for other describe sub commands. Something like this:

The UX design makes me feel we should have it, what do you think @wtrocki ?