Kafka output plugin to support kafka rack awareness

[kimxogus]

Describe the enhancement:

As described in #9675 , beats doesn't support kafka rack awareness feature yet.
Rack awareness will help to reduce cross-zone network traffics so that we can reduce network cost and latancies.

Describe a specific use case for the enhancement or feature:

        output.kafka:
          hosts: [...]
          topic: ...
          client_id: ...
          client_rack: "${AZ_ID}"

[botelastic]

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