Introduce BeanRegistrarDsl

This commit introduces a new BeanRegistrarDsl that supersedes
BeanDefinitionDsl which is now deprecated.

See BeanRegistrarDslConfigurationTests for a concrete example.

See gh-18353

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

@@ -0,0 +1,89 @@
+/*
+ * Copyright 2002-2025 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.context.annotation
+
+import org.assertj.core.api.Assertions.assertThat
+import org.assertj.core.api.Assertions.assertThatThrownBy
+import org.assertj.core.api.ThrowableAssert
+import org.junit.jupiter.api.Test
+import org.springframework.beans.factory.InitializingBean
+import org.springframework.beans.factory.NoSuchBeanDefinitionException
+import org.springframework.beans.factory.config.BeanDefinition
+import org.springframework.beans.factory.getBean
+import org.springframework.beans.factory.BeanRegistrarDsl
+
+/**
+ * Kotlin tests leveraging [BeanRegistrarDsl].
+ *
+ * @author Sebastien Deleuze
+ */
+class BeanRegistrarDslConfigurationTests {
+
+	@Test
+	fun beanRegistrar() {
+		val context = AnnotationConfigApplicationContext(BeanRegistrarKotlinConfiguration::class.java)
+		assertThat(context.getBean<Bar>().foo).isEqualTo(context.getBean<Foo>())
+		assertThatThrownBy(ThrowableAssert.ThrowingCallable { context.getBean<Baz>() }).isInstanceOf(NoSuchBeanDefinitionException::class.java)
+		assertThat(context.getBean<Init>().initialized).isTrue()
+		val beanDefinition = context.getBeanDefinition("bar")
+		assertThat(beanDefinition.scope).isEqualTo(BeanDefinition.SCOPE_PROTOTYPE)
+		assertThat(beanDefinition.isLazyInit).isTrue()
+		assertThat(beanDefinition.description).isEqualTo("Custom description")
+	}
+
+	@Test
+	fun beanRegistrarWithProfile() {
+		val context = AnnotationConfigApplicationContext()
+		context.register(BeanRegistrarKotlinConfiguration::class.java)
+		context.getEnvironment().addActiveProfile("baz")
+		context.refresh()
+		assertThat(context.getBean<Bar>().foo).isEqualTo(context.getBean<Foo>())
+		assertThat(context.getBean<Baz>().message).isEqualTo("Hello World!")
+		assertThat(context.getBean<Init>().initialized).isTrue()
+	}
+
+	class Foo
+	data class Bar(val foo: Foo)
+	data class Baz(val message: String = "")
+	class Init  : InitializingBean {
+		var initialized: Boolean = false
+
+		override fun afterPropertiesSet() {
+			initialized = true
+		}
+
+	}
+
+	@Configuration
+	@Import(SampleBeanRegistrar::class)
+	internal class BeanRegistrarKotlinConfiguration
+
+	private class SampleBeanRegistrar : BeanRegistrarDsl({
+		registerBean<Foo>()
+		registerBean<Bar>(
+			name = "bar",
+			prototype = true,
+			lazyInit = true,
+			description = "Custom description") {
+			Bar(bean<Foo>())
+		}
+		profile("baz") {
+			registerBean { Baz("Hello World!") }
+		}
+		registerBean<Init>()
+	})
+}

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2025 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.
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+@file:Suppress("DEPRECATION")
 package org.springframework.context.support
 
 import org.assertj.core.api.Assertions.assertThat