GH-434 Added generic FunctionInvoker for AWS

- Added generic FunctionInvoker capable of handling the request generically without requiring user to implemen specific AWS request handler

Resolves #434

spring-cloud-function-samples/function-sample-aws/src/main/java/example/FunctionConfiguration.java

@@ -0,0 +1,24 @@
+package example;
+
+import java.util.function.Function;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+
+@SpringBootApplication
+public class FunctionConfiguration {
+
+	/*
+	 * You need this main method or explicit <start-class>example.FunjctionConfiguration</start-class>
+	 * in the POM to ensure boot plug-in makes the correct entry
+	 */
+	public static void main(String[] args) {
+		SpringApplication.run(FunctionConfiguration.class, args);
+	}
+
+	@Bean
+	public Function<String, String> uppercase() {
+		return value -> value.toUpperCase();
+	}
+}