Add withInputType Kotlin extension

This commit adds a Kotlin extension function for
FunctionCallbackWrapper.Builder.withInputType allowing
to specify withInputType<T>() instead of
withInputType(T::class.java).

Author: sdeleuze

spring-ai-core/src/main/kotlin/org/springframework/ai/model/function/FunctionCallbackWrapperExtensions.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2023-2024 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.ai.model.function
+
+/**
+ * Extension for [FunctionCallbackWrapper.Builder.withInputType] providing a `withInputType<Foo>()`
+ * variant.
+ *
+ * @author Sebastien Deleuze
+ */
+inline fun <reified T>  FunctionCallbackWrapper.Builder<*, *>.withInputType() =
+	withInputType(T::class.java)

spring-ai-core/src/test/kotlin/org/springframework/ai/model/function/FunctionCallbackWrapperExtensionsTests.kt

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2023-2024 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.ai.model.function
+
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.verify
+import org.junit.jupiter.api.Test
+
+class FunctionCallbackWrapperExtensionsTests {
+
+	private val builder = mockk<FunctionCallbackWrapper.Builder<WeatherRequest, WeatherResponse>>()
+
+	@Test
+	fun withInputType() {
+		every { builder.withInputType(any<Class<*>>()) } returns builder
+		builder.withInputType<WeatherRequest>()
+		verify { builder.withInputType(WeatherRequest::class.java) }
+	}
+}