Add Supplier Exporter sample

spring-cloud-function-samples/function-sample-supplier-exporter/src/main/java/com/example/demo/DemoApplication.java

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+package com.example.demo;
+
+import java.util.function.Function;
+
+import org.springframework.boot.SpringBootConfiguration;
+import org.springframework.cloud.function.context.FunctionRegistration;
+import org.springframework.cloud.function.context.FunctionType;
+import org.springframework.cloud.function.context.FunctionalSpringApplication;
+import org.springframework.context.ApplicationContextInitializer;
+import org.springframework.context.support.GenericApplicationContext;
+
+@SpringBootConfiguration(proxyBeanMethods = false)
+public class DemoApplication
+		implements ApplicationContextInitializer<GenericApplicationContext> {
+
+	public static void main(String[] args) {
+		FunctionalSpringApplication.run(DemoApplication.class, args);
+	}
+
+	@Override
+	public void initialize(GenericApplicationContext context) {
+		context.registerBean("foobar", FunctionRegistration.class,
+				() -> new FunctionRegistration<>(new Foobar())
+						.type(FunctionType.from(Foo.class).to(Foo.class)));
+	}
+
+}
+
+class Foo {
+	private String name;
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	public Foo(String name) {
+		this.name = name;
+	}
+
+	Foo() {
+	}
+}
+
+class Foobar implements Function<Foo, Foo> {
+
+	@Override
+	public Foo apply(Foo input) {
+		System.err.println("HI: " + input.getName());
+		return new Foo("hi " + input.getName() + "!");
+	}
+}

spring-cloud-function-samples/function-sample-supplier-exporter/src/main/resources/META-INF/native-image/reflect-config.json

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+[
+	{
+		"name": "com.example.demo.Foo",
+		"allDeclaredConstructors": true,
+		"allDeclaredMethods": true
+	}
+]

spring-cloud-function-samples/function-sample-supplier-exporter/src/main/resources/application.properties

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+spring.cloud.function.web.export.enabled=true
+spring.cloud.function.web.export.debug=true
+spring.main.web-application-type=none
+logging.level.org.springframework.cloud=DEBUG