Add BeanRegistrarDsl.register

See gh-34557

spring-beans/src/main/kotlin/org/springframework/beans/factory/BeanRegistrarDsl.kt

@@ -334,6 +334,15 @@ open class BeanRegistrarDsl(private val init: BeanRegistrarDsl.() -> Unit): Bean
 		return registry.registerBean(T::class.java, customizer)
 	}
 
+	/**
+	 * Register beans using the given [BeanRegistrar].
+	 * @param registrar the bean registrar that will be called to register
+	 * additional beans
+	 */
+	fun register(registrar: BeanRegistrar) {
+		return registry.register(registrar)
+	}
+
 	/**
 	 * Apply the nested block if the given profile expression matches the
 	 * active profiles.

spring-context/src/test/kotlin/org/springframework/context/annotation/BeanRegistrarDslConfigurationTests.kt

@@ -65,6 +65,12 @@ class BeanRegistrarDslConfigurationTests {
 		assertThat(beanDefinition.resolvableType.resolveGeneric(0)).isEqualTo(Foo::class.java)
 	}
 
+	@Test
+	fun chainedBeanRegistrar() {
+		val context = AnnotationConfigApplicationContext(ChainedBeanRegistrarKotlinConfiguration::class.java)
+		assertThat(context.getBean<Bar>().foo).isEqualTo(context.getBean<Foo>())
+	}
+
 	class Foo
 	data class Bar(val foo: Foo)
 	data class Baz(val message: String = "")
@@ -109,4 +115,12 @@ class BeanRegistrarDslConfigurationTests {
 			}
 		}
 	})
+
+	@Configuration
+	@Import(ChainedBeanRegistrar::class)
+	internal class ChainedBeanRegistrarKotlinConfiguration
+
+	private class ChainedBeanRegistrar : BeanRegistrarDsl({
+		register(SampleBeanRegistrar())
+	})
 }