Provide first-class support for all Kafka configuration options

[philwebb]

As discussed in #17389 our existing approach is not ideal. It would be nice if we could somehow expose all configuration options as "first-class" properties with metadata and, therefore, IDE auto-completion.

[MadJlzz]

I've hit this point very recently after seeing that KafkaProperties was missing configuration properties.
Apart from creating a "first-class" exposing all of Kafka properties like you mentionned, I don't know how you want to manage this... Sadly, I find this solution quite unmaintanable...

[Wzy19930507]

Apache Kafka use org.apache.kafka.common.config.ConfigDef management peoperties metadate(key, doc, default value etc.).
perhaps can create adaptor for
mapping org.apache.kafka.clients.consumer.ConsumerConfig#configDef to spring.kafka.consumer.properties and
mapping org.apache.kafka.clients.producer.ProducerConfig#configDef to spring.kafka.producer.properties