Add commons-validator dependency (#1574)

### Motivation
```
Error:  Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project pulsar-protocol-handler-kafka: Compilation failure
Error:  /home/runner/work/kop/kop/kafka-impl/src/main/java/io/streamnative/pulsar/handlers/kop/AdvertisedListener.java:[23,45] package org.apache.commons.validator.routines does not exist
Error:  -> [Help 1]
Error:
Error:  To see the full stack trace of the errors, re-run Maven with the -e switch.
Error:  Re-run Maven using the -X switch to enable full debug logging.
Error:
Error:  For more information about the errors and possible solutions, please read the following articles:
Error:  [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
Error:
Error:  After correcting the problems, you can resume the build with the command
Error:    mvn <args> -rf :pulsar-protocol-handler-kafka
Error: Process completed with exit code 1.
```

kafka-impl/pom.xml

@@ -81,6 +81,11 @@
       <artifactId>jackson-dataformat-yaml</artifactId>
     </dependency>
 
+    <dependency>
+      <groupId>commons-validator</groupId>
+      <artifactId>commons-validator</artifactId>
+    </dependency>
+
     <dependency>
       <groupId>org.testng</groupId>
       <artifactId>testng</artifactId>

pom.xml

@@ -55,6 +55,7 @@
     <junit.version>4.13.1</junit.version>
     <fusionauth-jwt.version>5.2.1</fusionauth-jwt.version>
     <snakeyaml.version>1.31</snakeyaml.version>
+    <commons-validator.version>1.7</commons-validator.version>
 
     <!-- plugin dependencies -->
     <license-maven-plugin.version>3.0.rc1</license-maven-plugin.version>
@@ -258,6 +259,11 @@
         <artifactId>snakeyaml</artifactId>
         <version>${snakeyaml.version}</version>
       </dependency>
+      <dependency>
+        <groupId>commons-validator</groupId>
+        <artifactId>commons-validator</artifactId>
+        <version>${commons-validator.version}</version>
+      </dependency>
     </dependencies>
   </dependencyManagement>