Polish "Add support for Kafka batch listener"

This commit reworks the property to be an enum with the list of
supported listener types rather than a boolean that flip to a
batch listener.

Closes gh-9448

spring-boot-docs/src/main/asciidoc/appendix-application-properties.adoc

@@ -986,7 +986,7 @@ content into your application; rather pick only the properties that you need.
 	spring.kafka.listener.ack-time= # Time in milliseconds between offset commits when ackMode is "TIME" or "COUNT_TIME".
 	spring.kafka.listener.concurrency= # Number of threads to run in the listener containers.
 	spring.kafka.listener.poll-timeout= # Timeout in milliseconds to use when polling the consumer.
-	spring.kafka.listener.batch-listener= # If true listener container factory will be configured to create batch listener.
+	spring.kafka.listener.type=single # Listener type.
 	spring.kafka.producer.acks= # Number of acknowledgments the producer requires the leader to have received before considering a request complete.
 	spring.kafka.producer.batch-size= # Number of records to batch before sending.
 	spring.kafka.producer.bootstrap-servers= # Comma-delimited list of host:port pairs to use for establishing the initial connection to the Kafka cluster.