feat: Adding backpressure design pattern #3233 (#3249)

* Initial commit backpressure

temp

* Adding backpressure pattern #3233

* Fix test case #3233

* Fix formatting #3233

* Changes after review #3233

* Fix sonar error in leaderfollowers module #3233

pom.xml

@@ -242,6 +242,7 @@
     <module>version-number</module>
     <module>virtual-proxy</module>
     <module>visitor</module>
+      <module>backpressure</module>
   </modules>
   <repositories>
     <repository>