Add Kotlin code samples to the AOT documentation

Closes gh-33761

Author: roll-w

framework-docs/modules/ROOT/pages/core/aot.adoc

@@ -290,6 +290,19 @@ Java::
 
 	}
 ----
+
+Kotlin::
++
+[source,kotlin,indent=0,subs="verbatim,quotes"]
+----
+	@Configuration(proxyBeanMethods = false)
+	class UserConfiguration {
+
+		@Bean
+		fun myInterface(): MyInterface = MyImplementation()
+
+	}
+----
 ======
 
 In the example above, the declared  type for the `myInterface` bean is `MyInterface`.
@@ -314,6 +327,19 @@ Java::
 
 	}
 ----
+
+Kotlin::
++
+[source,kotlin,indent=0,subs="verbatim,quotes"]
+----
+	@Configuration(proxyBeanMethods = false)
+	class UserConfiguration {
+
+		@Bean
+		fun myInterface() = MyImplementation()
+
+	}
+----
 ======
 
 If you are registering bean definitions programmatically, consider using `RootBeanBefinition` as it allows to specify a `ResolvableType` that handles generics.
@@ -371,6 +397,15 @@ Java::
 		// ...
 	}
 ----
+
+Kotlin::
++
+[source,kotlin,indent=0,subs="verbatim,quotes"]
+----
+	class ClientFactoryBean<T : AbstractClient> : FactoryBean<T> {
+		// ...
+	}
+----
 ======
 
 A concrete client declaration should provide a resolved generic for the client, as shown in the following example:
@@ -391,6 +426,19 @@ Java::
 
 	}
 ----
+
+Kotlin::
++
+[source,kotlin,indent=0,subs="verbatim,quotes"]
+----
+	@Configuration(proxyBeanMethods = false)
+	class UserConfiguration {
+
+		@Bean
+		fun myClient() = ClientFactoryBean<MyClient>(...)
+
+	}
+----
 ======
 
 If the `FactoryBean` bean definition is registered programmatically, make sure to follow these steps:
@@ -412,6 +460,16 @@ Java::
     // ...
     registry.registerBeanDefinition("myClient", beanDefinition);
 ----
+
+Kotlin::
++
+[source,kotlin,indent=0,subs="verbatim,quotes"]
+----
+    val beanDefinition = RootBeanDefinition(ClientFactoryBean::class.java)
+    beanDefinition.setTargetType(ResolvableType.forClassWithGenerics(ClientFactoryBean::class.java, MyClient::class.java));
+    // ...
+    registry.registerBeanDefinition("myClient", beanDefinition)
+----
 ======
 
 [[aot.bestpractices.jpa]]
@@ -433,6 +491,19 @@ Java::
 		return factoryBean;
 	}
 ----
+
+Kotlin::
++
+[source,kotlin,indent=0,subs="verbatim,quotes"]
+----
+	@Bean
+	fun customDBEntityManagerFactory(dataSource: DataSource): LocalContainerEntityManagerFactoryBean {
+		val factoryBean = LocalContainerEntityManagerFactoryBean()
+		factoryBean.dataSource = dataSource
+		factoryBean.setPackagesToScan("com.example.app")
+		return factoryBean
+	}
+----
 ======
 
 To make sure the scanning occurs ahead of time, a `PersistenceManagedTypes` bean must be declared and used by the
@@ -458,6 +529,25 @@ Java::
 		return factoryBean;
 	}
 ----
+
+Kotlin::
++
+[source,kotlin,indent=0,subs="verbatim,quotes"]
+----
+	@Bean
+	fun persistenceManagedTypes(resourceLoader: ResourceLoader): PersistenceManagedTypes {
+		return PersistenceManagedTypesScanner(resourceLoader)
+				.scan("com.example.app")
+	}
+
+	@Bean
+	fun customDBEntityManagerFactory(dataSource: DataSource, managedTypes: PersistenceManagedTypes): LocalContainerEntityManagerFactoryBean {
+		val factoryBean = LocalContainerEntityManagerFactoryBean()
+		factoryBean.dataSource = dataSource
+		factoryBean.setManagedTypes(managedTypes)
+		return factoryBean
+	}
+----
 ======
 
 [[aot.hints]]
@@ -479,6 +569,13 @@ Java::
 ----
 	runtimeHints.resources().registerPattern("config/app.properties");
 ----
+
+Kotlin::
++
+[source,kotlin,indent=0,subs="verbatim,quotes"]
+----
+	runtimeHints.resources().registerPattern("config/app.properties")
+----
 ======
 
 A number of contracts are handled automatically during AOT processing.