Add consumer exception handler callback - #4514
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Signed-off-by: Aman Gautam <amangautam2128@gmail.com>
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Fixes #4490
Adds a dedicated ConsumerExceptionHandler callback that can be configured through ContainerProperties.
The callback is invoked from KafkaMessageListenerContainer.ListenerConsumer#handleConsumerException, allowing applications to react to consumer-level exceptions without configuring a CommonErrorHandler.
This is useful for applications that rely on AfterRollbackProcessor-based listener error handling and do not want to participate in the CommonErrorHandler flow, while still being able to handle fatal consumer exceptions.