GH-1517: Add CompositeContainerCustomizer

Resolves #1517

Add configuration support for multiple ContainerCustomizer at once

spring-rabbit/src/main/java/org/springframework/amqp/rabbit/config/CompositeContainerCustomizer.java

@@ -0,0 +1,23 @@
+package org.springframework.amqp.rabbit.config;
+
+import java.util.List;
+import org.springframework.amqp.rabbit.listener.MessageListenerContainer;
+import org.springframework.util.Assert;
+
+/**
+ * Implementation of {@link ContainerCustomizer<C>} providing the configuration of multiple customizers at the same time.
+ */
+public class CompositeContainerCustomizer<C extends MessageListenerContainer> implements ContainerCustomizer<C> {
+
+	private final List<ContainerCustomizer<C>> customizers;
+
+	public CompositeContainerCustomizer(List<ContainerCustomizer<C>> customizers) {
+		Assert.notNull(customizers, "At least one customizer must be present");
+		this.customizers = customizers;
+	}
+
+	@Override
+	public void configure(C container) {
+		customizers.forEach(c -> c.configure(container));
+	}
+}