KAFKA-18658 add import control for examples module (#18812)

Reviewers: Chia-Ping Tsai <chia7712@gmail.com>

build.gradle

@@ -1800,7 +1800,7 @@ project(':examples') {
   }
 
   checkstyle {
-    configProperties = checkstyleConfigProperties("import-control-core.xml")
+    configProperties = checkstyleConfigProperties("import-control-examples.xml")
   }
 }
 

checkstyle/import-control-examples.xml

@@ -0,0 +1,42 @@
+<!DOCTYPE import-control PUBLIC
+"-//Puppy Crawl//DTD Import Control 1.1//EN"
+"http://www.puppycrawl.com/dtds/import_control_1_1.dtd">
+<!--
+ Licensed to the Apache Software Foundation (ASF) under one or more
+ contributor license agreements.  See the NOTICE file distributed with
+ this work for additional information regarding copyright ownership.
+ The ASF licenses this file to You under the Apache License, Version 2.0
+ (the "License"); you may not use this file except in compliance with
+ the License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+-->
+
+<import-control pkg="kafka.examples">
+
+  <!-- common library dependencies -->
+  <allow pkg="java" />
+  <allow pkg="scala" />
+  <allow pkg="javax.management" />
+  <allow pkg="org.slf4j" />
+  <allow pkg="org.junit" />
+  <allow pkg="java.security" />
+  <allow pkg="javax.net.ssl" />
+  <allow pkg="javax.security" />
+
+  <!-- public API-->
+  <allow pkg="org.apache.kafka.clients.consumer" />
+  <allow pkg="org.apache.kafka.clients.producer" />
+  <allow pkg="org.apache.kafka.clients.admin" />
+  <allow pkg="org.apache.kafka.common" />
+  <allow pkg="org.apache.kafka.common.errors" />
+  <allow pkg="org.apache.kafka.common.serialization" />
+  
+
+</import-control>