Configure ClustersProperties.AdminClient per ClustersProperties.Cluster

[alkur-gh]

Issue submitter TODO list

• I've searched for an already existing issues here
• I'm running a supported version of the application which is listed here and the feature is not present there

Is your proposal related to a problem?

We have one Kafbat instance connected to old and less old Kafka clusters (2.8 & 3.6). In the old clusters, ReactiveAdminClient.listConsumerGroupOffsets is very slow because AdminClient performs sequential OffsetFetch requests in a single thread. Decreasing ClustersProperties.AdminClient.listConsumerGroupOffsetsPartitionSize to 1-2 helps with the old clusters, but makes ReactiveAdminClient.listConsumerGroupOffsets a bit slower for the new clusters. It would be nice to have the option to assign different partition sizes to different clusters.

Describe the feature you're interested in

kafka:
  clusters:
    - name: cluster-1
      bootstrap-servers: 127.0.0.1:9092
      admin-client:
        list-consumer-group-offsets-partition-size: 1
        list-consumer-group-offsets-concurrency: 16

    - name: cluster-2
      bootstrap-servers: 127.0.0.2:9092
      admin-client:
        list-consumer-group-offsets-partition-size: 200
        list-consumer-group-offsets-concurrency: 4

Describe alternatives you've considered

No response

Version you're running

dfa5a7e

Additional context

No response

[github-actions]

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