Refactored Binder and Codec configuration

- replaced XML-based configuration with Java configuration
- removed optional on spring-cloud-stream-codec
- removed unnecessary test

spring-cloud-stream-codec/pom.xml

@@ -39,15 +39,11 @@
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-autoconfigure</artifactId>
+			<optional>true</optional>
 		</dependency>
 		<dependency>
 			<groupId>com.fasterxml.jackson.core</groupId>
 			<artifactId>jackson-annotations</artifactId>
 		</dependency>
-		<dependency>
-			<groupId>org.springframework.boot</groupId>
-			<artifactId>spring-boot-starter-test</artifactId>
-			<scope>test</scope>
-		</dependency>
 	</dependencies>
 </project>