Do not consider all @Components as configuration

Update ConfigurationClassUtils to only consider beans with @Bean
methods as 'lite' configuration candidates.

Prior to this commit all @Component beans were considered 'lite'
configuration candidates which could result in a large number of
ConfigurationClass instance being created that would ultimately be
ignored.

Issue: SPR-10609

spring-context/src/test/java/org/springframework/context/annotation/componentscan/simple/SimpleComponent.java

@@ -16,9 +16,15 @@
 
 package org.springframework.context.annotation.componentscan.simple;
 
+import org.springframework.context.annotation.Bean;
 import org.springframework.stereotype.Component;
 
 @Component
 public class SimpleComponent {
 
+	@Bean
+	public String exampleBean() {
+		return "example";
+	}
+
 }