Is your feature request related to a problem? Please describe.
We sometimes have the problem, that a topic is no longer subscribed by a consumer group (e.g. after a software update). Kafka keeps this topics for 7 days (default) in the consumer group. This consumer groups often cause monitoring alerts due to the lag that is accounted for this topics.

We would like to find a way to delete this topics from the consumer group automatically. Therefor we need 'deleteConsumerGroups' in the admin interface.

Describe the solution you'd like
'deleteConsumerGroups' should be implemented in the Admin client.

Additional context
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