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.