Allow bean factory initialization to have a more flexible signature

This commit allows bean factory initialization to use a more flexible
signature than just consuming the DefaultListableBeanFactory. The
environment and the resource loader can now be specified if necessary.

See gh-29005

spring-beans/src/main/java/org/springframework/beans/factory/aot/BeanFactoryInitializationCode.java

@@ -24,6 +24,7 @@ import org.springframework.aot.generate.MethodReference;
  * perform bean factory initialization.
  *
  * @author Phillip Webb
+ * @author Stephane Nicoll
  * @since 6.0
  * @see BeanFactoryInitializationAotContribution
  */
@@ -41,10 +42,16 @@ public interface BeanFactoryInitializationCode {
 	GeneratedMethods getMethods();
 
 	/**
-	 * Add an initializer method call.
-	 * @param methodReference a reference to the initialize method to call. The
-	 * referenced method must have the same functional signature as
-	 * {@code Consumer<DefaultListableBeanFactory>}.
+	 * Add an initializer method call. An initializer can use a flexible signature,
+	 * using any of the following:
+	 * <ul>
+	 * <li>{@code DefaultListableBeanFactory}, or {@code ConfigurableListableBeanFactory}
+	 * to use the bean factory.</li>
+	 * <li>{@code ConfigurableEnvironment} or {@code Environment} to access the
+	 * environment.</li>
+	 * <li>{@code ResourceLoader} to load resources.</li>
+	 * </ul>
+	 * @param methodReference a reference to the initialize method to call.
 	 */
 	void addInitializer(MethodReference methodReference);