Infer reflection hints for Jackson annotations builder attributes

This notably enables Jackson to reflectively call a user-provided
builder class and invoke its declared methods (setters and build) in
a native app.

Closes gh-32238

Author: simonbasle

spring-core/src/main/java/org/springframework/aot/hint/BindingReflectionHintsRegistrar.java

@@ -200,9 +200,15 @@ private void forEachJacksonAnnotation(AnnotatedElement element, Consumer<MergedA
 	}
 
 	private void registerHintsForClassAttributes(ReflectionHints hints, MergedAnnotation<Annotation> annotation) {
-		annotation.getRoot().asMap().values().forEach(value -> {
+		annotation.getRoot().asMap().forEach((key,value) -> {
 			if (value instanceof Class<?> classValue && value != Void.class) {
-				hints.registerType(classValue, MemberCategory.INVOKE_DECLARED_CONSTRUCTORS);
+				if (key.equals("builder")) {
+					hints.registerType(classValue, MemberCategory.INVOKE_DECLARED_CONSTRUCTORS,
+							MemberCategory.INVOKE_DECLARED_METHODS);
+				}
+				else {
+					hints.registerType(classValue, MemberCategory.INVOKE_DECLARED_CONSTRUCTORS);
+				}
 			}
 		});
 	}

spring-core/src/test/java/org/springframework/aot/hint/BindingReflectionHintsRegistrarTests.java

@@ -287,7 +287,8 @@ void registerTypeForJacksonCustomStrategy() {
 		bindingRegistrar.registerReflectionHints(this.hints.reflection(), SampleRecordWithJacksonCustomStrategy.class);
 		assertThat(RuntimeHintsPredicates.reflection().onType(PropertyNamingStrategies.UpperSnakeCaseStrategy.class).withMemberCategory(MemberCategory.INVOKE_DECLARED_CONSTRUCTORS))
 				.accepts(this.hints);
-		assertThat(RuntimeHintsPredicates.reflection().onType(SampleRecordWithJacksonCustomStrategy.Builder.class).withMemberCategory(MemberCategory.INVOKE_DECLARED_CONSTRUCTORS))
+		assertThat(RuntimeHintsPredicates.reflection().onType(SampleRecordWithJacksonCustomStrategy.Builder.class)
+				.withMemberCategories(MemberCategory.INVOKE_DECLARED_CONSTRUCTORS, MemberCategory.INVOKE_DECLARED_METHODS))
 				.accepts(this.hints);
 	}