GH-3040: Add virtual threads customizer for RabbitMQ binder

Fixes: #3040

This change adds out-of-the-box `ListenerContainerCustomizer<AbstractMessageListenerContainer>`
to set `VirtualThreadTaskExecutor` into an `AbstractMessageListenerContainer` created by the binder
when `Threading.VIRTUAL` condition is met

binders/rabbit-binder/spring-cloud-stream-binder-rabbit/src/main/java/org/springframework/cloud/stream/binder/rabbit/config/RabbitMessageChannelBinderConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2015-2023 the original author or authors.
+ * Copyright 2015-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -24,12 +24,15 @@
 import org.springframework.amqp.rabbit.connection.AbstractConnectionFactory;
 import org.springframework.amqp.rabbit.connection.ConnectionFactory;
 import org.springframework.amqp.rabbit.connection.ConnectionNameStrategy;
+import org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer;
 import org.springframework.amqp.rabbit.listener.MessageListenerContainer;
 import org.springframework.amqp.support.postprocessor.DelegatingDecompressingPostProcessor;
 import org.springframework.amqp.support.postprocessor.GZipPostProcessor;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.autoconfigure.amqp.RabbitProperties;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnThreading;
 import org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration;
+import org.springframework.boot.autoconfigure.thread.Threading;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.cloud.stream.binder.rabbit.RabbitMessageChannelBinder;
 import org.springframework.cloud.stream.binder.rabbit.properties.RabbitBinderConfigurationProperties;
@@ -42,6 +45,7 @@
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Import;
+import org.springframework.core.task.VirtualThreadTaskExecutor;
 import org.springframework.integration.amqp.inbound.AmqpInboundChannelAdapter;
 import org.springframework.integration.amqp.inbound.AmqpMessageSource;
 import org.springframework.lang.Nullable;
@@ -150,4 +154,15 @@ MessagePostProcessor gZipPostProcessor() {
 	RabbitExchangeQueueProvisioner provisioningProvider(List<DeclarableCustomizer> customizers) {
 		return new RabbitExchangeQueueProvisioner(this.rabbitConnectionFactory, customizers);
 	}
+
+	@Bean
+	@ConditionalOnThreading(Threading.VIRTUAL)
+	ListenerContainerCustomizer<MessageListenerContainer> listenerContainerVirtualThreadExecutorCustomizer() {
+		return (container, destinationName, group) -> {
+			if (container instanceof AbstractMessageListenerContainer listenerContainer) {
+				listenerContainer.setTaskExecutor(new VirtualThreadTaskExecutor(destinationName + "-"));
+			}
+		};
+	}
+
 }