Add support for target type to BeanRegistry

Closes gh-34560

spring-context/src/test/java/org/springframework/context/annotation/beanregistrar/BeanRegistrarConfigurationTests.java

@@ -21,12 +21,15 @@ import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.BeanRegistrar;
 import org.springframework.beans.factory.NoSuchBeanDefinitionException;
 import org.springframework.beans.factory.config.BeanDefinition;
+import org.springframework.beans.factory.support.RootBeanDefinition;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.context.testfixture.beans.factory.GenericBeanRegistrar;
 import org.springframework.context.testfixture.beans.factory.SampleBeanRegistrar.Bar;
 import org.springframework.context.testfixture.beans.factory.SampleBeanRegistrar.Baz;
 import org.springframework.context.testfixture.beans.factory.SampleBeanRegistrar.Foo;
 import org.springframework.context.testfixture.beans.factory.SampleBeanRegistrar.Init;
 import org.springframework.context.testfixture.context.annotation.registrar.BeanRegistrarConfiguration;
+import org.springframework.context.testfixture.context.annotation.registrar.GenericBeanRegistrarConfiguration;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
@@ -69,4 +72,13 @@ public class BeanRegistrarConfigurationTests {
 		assertThat(context.getBean(Init.class).initialized).isTrue();
 	}
 
+	@Test
+	void beanRegistrarWithTargetType() {
+		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
+		context.register(GenericBeanRegistrarConfiguration.class);
+		context.refresh();
+		RootBeanDefinition beanDefinition = (RootBeanDefinition)context.getBeanDefinition("fooSupplier");
+		assertThat(beanDefinition.getResolvableType().resolveGeneric(0)).isEqualTo(GenericBeanRegistrar.Foo.class);
+	}
+
 }