Added initial support for lazy style FunctionCatalog/Registry which:

-  does not rely on any of the existing wrappers and instead relies on internal wrapper which performs  in-flight/just-in-time wrapping and unwrapping from reactive to imperative types
- performs transparent type conversion relying on MessageConverters and ConversionService
- supports multiple inputs/outputs

spring-cloud-function-adapters/spring-cloud-function-adapter-aws/src/test/java/org/springframework/cloud/function/adapter/aws/SpringBootApiGatewayRequestHandlerTests.java

@@ -26,6 +26,7 @@ import java.util.function.Supplier;
 
 import com.amazonaws.services.lambda.runtime.events.APIGatewayProxyRequestEvent;
 import com.amazonaws.services.lambda.runtime.events.APIGatewayProxyResponseEvent;
+import org.junit.After;
 import org.junit.Test;
 
 import org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration;
@@ -46,6 +47,11 @@ public class SpringBootApiGatewayRequestHandlerTests {
 
 	private SpringBootApiGatewayRequestHandler handler;
 
+	@After
+	public void after() {
+		System.clearProperty("function.name");
+	}
+
 	@Test
 	public void supplierBean() {
 		System.setProperty("function.name", "supplier");
@@ -143,6 +149,7 @@ public class SpringBootApiGatewayRequestHandlerTests {
 				.isEqualTo("GET");
 		assertThat(((APIGatewayProxyResponseEvent) output).getBody())
 				.isEqualTo("{\"value\":\"body\"}");
+
 	}
 
 	@Test