reset offset to earliest in kafka-consumer-groups

`kafka-consumer-groups --bootstrap-server localhost:9092 --group kafka-group --topic test_log --reset-offsets --to-earliest --execute`

The issue provides only a kafka-consumer-groups command and does not name a file, test, or intended change. First locate where ak-cli stores its command catalog, then determine whether this command should be documented there; done means the command is included in the appropriate collection and any relevant checks pass.

Written by the indexing model from the issue text.