feat: Add Service Stub Pattern using Sentiment Analysis example (#3215)

* Add Service Stub Pattern using Sentiment Analysis example

* Fix Checkstyle issues

* Suppress Sonar warning for Random usage in RealSentimentAnalysisServer

pom.xml

@@ -224,6 +224,7 @@
     <module>table-inheritance</module>
     <module>bloc</module>
     <module>map-reduce</module>
+      <module>service-stub</module>
   </modules>
   <repositories>
     <repository>