feat: add ban duplicate classes rule (#126)

* feat: add ban duplicate classes rule * feat: add extra enforcer dep

Author: stephaniewang526

pom.xml

@@ -101,6 +101,13 @@
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-enforcer-plugin</artifactId>
  <version>3.0.0-M3</version>
+ <dependencies>
+ <dependency>
+ <groupId>org.codehaus.mojo</groupId>
+ <artifactId>extra-enforcer-rules</artifactId>
+ <version>1.2</version>
+ </dependency>
+ </dependencies>
  </plugin>
  <plugin>
  <groupId>org.codehaus.mojo</groupId>
@@ -259,6 +266,14 @@
  <version>[1.7,)</version>
  </requireJavaVersion>
  <requireUpperBoundDeps/>
+ <banDuplicateClasses>
+ <scopes>
+ <scope>compile</scope>
+ <scope>provided</scope>
+ </scopes>
+ <findAllDuplicates>true</findAllDuplicates>
+ <ignoreWhenIdentical>true</ignoreWhenIdentical>
+ </banDuplicateClasses>
  </rules>
  </configuration>
  </execution>