Tag EventListener as a reflective operation

This commit adds compatibility of declarative event listeners in a
native image.

See gh-28475

Author: snicoll

spring-context/src/main/java/org/springframework/context/event/EventListener.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -23,6 +23,7 @@
 import java.lang.annotation.Target;
 import java.util.function.Predicate;
 
+import org.springframework.aot.hint.annotation.Reflective;
 import org.springframework.context.ApplicationEvent;
 import org.springframework.core.annotation.AliasFor;
 
@@ -89,6 +90,7 @@
 @Target({ElementType.METHOD, ElementType.ANNOTATION_TYPE})
 @Retention(RetentionPolicy.RUNTIME)
 @Documented
+@Reflective
 public @interface EventListener {
 
 	/**