Use Kafka client specific consumer/producer config properties

Currently, the configuration of the Kafka consumer for receiving command messages in the Command Router component is done via the generic Kafka configuration properties:

hono:
  kafka:
    consumerConfig:
      bootstrap.servers: [...]
      [...]

Especially with the introduction of another kind of Kafka consumer in the Command Router (see #2837), there should be a way to configure the Kafka command consumer explicitly.

The Command Router Kafka command consumer config needs:

• standard Kafka config properties passed on to the Kafka consumer
• specific properties introduced by the Hono consumer classes, like HonoKafkaConsumer#POLL_TIMEOUT and the AsyncHandlingAutoCommitKafkaConsumer#CONFIG[*] properties (see also the Hono KafkaConsumerConfigProperties class, currently not used for these classes)

The definition of the new config structure should be done taking into account how the AMQP messaging network command consumer is configured. This is currently done like this:

hono:
  command:
    name: 'Hono Command Router'
    host: someHost
    tlsEnabled: true
    trustStorePath: /etc/hono/trusted-certs.pem
    initialCredits: 2000
    sendMessageTimeout: 5000
    linkEstablishmentTimeout: 1000

[b-abel]

Yes. I would move the property commonClientConfig from the current class AbstractKafkaConfigProperties into a new one. It could be called for example KafkaClientConnectionConfigProperties. On the other Kafka config classes, I would then add a setter for this new type.

[b-abel]

Resolved by #2972 and #2989.