adding checkstyle for siddhi service
<suppress checks="Javadoc.*" files=".*/src/test/java/.*"/>
<suppress checks=".*" files=".*/antlr4/org/wso2/siddhi/query/compiler/*" />
+ <suppress checks=".*" files=".*/src/gen/java/org/wso2/siddhi/service/*" />
<suppress checks="JavadocPackage" files=".*/src/(main|integration)/java/.*"/>
<suppress checks="JavadocPackage" files=".*/src/.*/internal/.*"/>
