GH-4152: Optimize ArrayList allocations in BatchMessagingMessageConverter

Pre-size all ArrayList instances with batch size to eliminate
internal array resizing and reduce GC pressure in high-throughput
batch processing scenarios.

Fixes: #4152

Signed-off-by: gobeomjun <[email protected]>

(cherry picked from commit 63613f7)

Author: K-jun98

spring-kafka/src/main/java/org/springframework/kafka/support/converter/BatchMessagingMessageConverter.java

@@ -169,17 +169,18 @@ public Message<?> toMessage(List<ConsumerRecord<?, ?>> records, @Nullable Acknow
 				new KafkaMessageHeaders(this.generateMessageId, this.generateTimestamp);
 
 		Map<String, Object> rawHeaders = kafkaMessageHeaders.getRawHeaders();
-		List<Object> payloads = new ArrayList<>();
-		List<Object> keys = new ArrayList<>();
-		List<String> topics = new ArrayList<>();
-		List<Integer> partitions = new ArrayList<>();
-		List<Long> offsets = new ArrayList<>();
-		List<String> timestampTypes = new ArrayList<>();
-		List<Long> timestamps = new ArrayList<>();
-		List<Map<String, Object>> convertedHeaders = new ArrayList<>();
-		List<Headers> natives = new ArrayList<>();
-		List<ConsumerRecord<?, ?>> raws = new ArrayList<>();
-		List<ConversionException> conversionFailures = new ArrayList<>();
+		int batchSize = records.size();
+		List<Object> payloads = new ArrayList<>(batchSize);
+		List<Object> keys = new ArrayList<>(batchSize);
+		List<String> topics = new ArrayList<>(batchSize);
+		List<Integer> partitions = new ArrayList<>(batchSize);
+		List<Long> offsets = new ArrayList<>(batchSize);
+		List<String> timestampTypes = new ArrayList<>(batchSize);
+		List<Long> timestamps = new ArrayList<>(batchSize);
+		List<Map<String, Object>> convertedHeaders = new ArrayList<>(batchSize);
+		List<Headers> natives = new ArrayList<>(batchSize);
+		List<ConsumerRecord<?, ?>> raws = new ArrayList<>(batchSize);
+		List<ConversionException> conversionFailures = new ArrayList<>(batchSize);
 
 		addToRawHeaders(rawHeaders, convertedHeaders, natives, raws, conversionFailures);
 		commonHeaders(acknowledgment, consumer, rawHeaders, keys, topics, partitions, offsets, timestampTypes,