Polished adapter initializers consolidation effort

- Added ability to retrieve input type from FunctionRegistration (if available) in AbstractSpringFunctionAdapterInitializer
- Removed azure/AzureSpringFunctionInitializer and aws/SpringFunctionInitializer
- Added additional tests in AWS and Azure modules
- See 0189c578ef for additional info

spring-cloud-function-adapters/spring-cloud-function-adapter-azure/src/test/java/org/springframework/cloud/function/adapter/azure/AzureSpringBootRequestHandlerTests.java

@@ -32,9 +32,10 @@ import org.springframework.context.annotation.Configuration;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
+
 /**
  * @author Dave Syer
- *
+ * @author Oleg Zhurakousky
  */
 public class AzureSpringBootRequestHandlerTests {
 
@@ -111,6 +112,13 @@ public class AzureSpringBootRequestHandlerTests {
 		assertThat(bar.getValue()).isEqualTo("BAR");
 	}
 
+	@Test
+	public void functionNonFluxBean() {
+		AzureSpringBootRequestHandler<Foo, Bar> handler = handler(NonFluxFunctionConfig.class);
+		Bar bar = handler.handleRequest(new Foo("bar"), new TestExecutionContext("function"));
+		assertThat(bar).isNotNull();
+	}
+
 	@After
 	public void close() throws IOException {
 		if (this.handler != null) {
@@ -118,6 +126,16 @@ public class AzureSpringBootRequestHandlerTests {
 		}
 	}
 
+	@Configuration
+	protected static class NonFluxFunctionConfig {
+
+		@Bean
+		public Function<Foo, Bar> function() {
+			return foo -> new Bar();
+		}
+
+	}
+
 	@Configuration
 	protected static class BareConfig {