Detect target of factory method with AOT

Previously, if a factory method is defined on a parent, the generated
code would blindly use the method's declaring class for both the target
of the generated code, and the signature of the method.

This commit improves the resolution by considering the factory metadata
in the BeanDefinition.

Closes gh-32609

spring-beans/src/testFixtures/java/org/springframework/beans/testfixture/beans/factory/aot/DefaultSimpleBeanContract.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2002-2024 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.beans.testfixture.beans.factory.aot;
+
+public class DefaultSimpleBeanContract implements SimpleBeanContract {
+
+	public SimpleBean anotherSimpleBean() {
+		return new SimpleBean();
+	}
+
+}

spring-beans/src/testFixtures/java/org/springframework/beans/testfixture/beans/factory/aot/SimpleBeanContract.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2002-2024 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.beans.testfixture.beans.factory.aot;
+
+/**
+ * Showcase a factory method that is defined on an interface.
+ *
+ * @author Stephane Nicoll
+ */
+public interface SimpleBeanContract {
+
+	default SimpleBean simpleBean() {
+		return new SimpleBean();
+	}
+
+}