intermediate changes

provider/notification-azure/src/main/java/org/opengroup/osdu/notification/provider/azure/pubsub/PubsubHandshakeHandler.java

+package org.opengroup.osdu.notification.provider.azure.pubsub;
+
+import org.opengroup.osdu.notification.pubsub.IPubsubHandshakeHandler;
+import org.springframework.http.ResponseEntity;
+
+public class PubsubHandshakeHandler implements IPubsubHandshakeHandler {
+
+    @Override
+    public ResponseEntity getHandshakeResponse() {
+        return null;
+    }
+}