Support Gradle-style Kotlin bean API

val context = GenericApplicationContext {
    registerBean<Foo>()
    registerBean { Bar(it.getBean<Foo>()) }
}

Issue: SPR-15126

spring-context/src/test/kotlin/org/springframework/context/support/GenericApplicationContextExtensionTests.kt

@@ -4,6 +4,7 @@ import org.junit.Assert.assertNotNull
 import org.junit.Test
 import org.springframework.context.support.GenericApplicationContextExtension.registerBean
 import org.springframework.beans.factory.BeanFactoryExtension.getBean
+import org.springframework.context.support.GenericApplicationContextExtension.GenericApplicationContext
 
 class GenericApplicationContextExtensionTests {
 
@@ -59,6 +60,17 @@ class GenericApplicationContextExtensionTests {
 		assertNotNull(context.getBean("b"))
 	}
 
+	@Test
+	fun registerBeanWithGradleStyleApi() {
+		val context = GenericApplicationContext {
+			registerBean<BeanA>()
+			registerBean { BeanB(it.getBean<BeanA>()) }
+		}
+		context.refresh()
+		assertNotNull(context.getBean<BeanA>())
+		assertNotNull(context.getBean<BeanB>())
+	}
+
 	internal class BeanA
 
 	internal class BeanB(val a: BeanA)