broker/Topic: class added

broker/Topic: String Topics replaced by Topic class
broker/Topic#parseTopic: access set to private
broker/SubscriptionsStoreTest: topic tests moved to own class
broker/TopicTest: containsExactly used
broker/TopicTest: TopicAssert class added
broker/TopicTest$TopicAssert#containsToken: method added
broker/TopicTest$TopicAssert#matches: method added

broker/src/main/java/io/moquette/interception/messages/InterceptSubscribeMessage.java

@@ -26,7 +26,7 @@ public class InterceptSubscribeMessage implements InterceptMessage {
     }
 
     public String getTopicFilter() {
-        return subscription.getTopicFilter();
+        return subscription.getTopicFilter().toString();
     }
 
     public String getUsername() {