INT-3554: Add Expression Setters

JIRA: https://jira.spring.io/browse/INT-3554

**Cherry-pick to 4.0.x**

Polishing

spring-integration-event/src/test/java/org/springframework/integration/event/inbound/ApplicationEventListeningMessageProducerTests.java

@@ -134,6 +134,7 @@ public class ApplicationEventListeningMessageProducerTests {
 	}
 
 	@Test
+	@SuppressWarnings("deprecation")
 	public void payloadExpressionEvaluatedAgainstApplicationEvent() {
 		QueueChannel channel = new QueueChannel();
 		ApplicationEventListeningMessageProducer adapter = new ApplicationEventListeningMessageProducer();