chore: add client libraries code

PiperOrigin-RevId: 925580572

Author: MarkDaoust

pom.xml

@@ -44,8 +44,8 @@
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <maven.compiler.source>1.8</maven.compiler.source>
-    <maven.compiler.target>1.8</maven.compiler.target>
+    <maven.compiler.source>11</maven.compiler.source>
+    <maven.compiler.target>11</maven.compiler.target>
     <google.auth.version>1.33.0</google.auth.version>
     <protobuf.version>3.25.5</protobuf.version>
     <google.api.version>2.45.0</google.api.version>
@@ -54,6 +54,7 @@
     <junit.version>5.11.4</junit.version>
     <java-websocket.version>1.6.0</java-websocket.version>
     <okhttp.version>4.12.0</okhttp.version>
+    <kotlin.version>1.9.10</kotlin.version>
     <main.java.src.dir>src/main/java</main.java.src.dir>
     <test.java.src.dir>src/test/java</test.java.src.dir>
   </properties>
@@ -191,6 +192,7 @@
           <artifactId>maven-compiler-plugin</artifactId>
           <version>3.13.0</version>
           <configuration>
+            <release>11</release>
             <annotationProcessorPaths>
               <path>
                 <groupId>com.google.auto.value</groupId>
@@ -301,6 +303,18 @@
       </plugins>
     </pluginManagement>
     <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-checkstyle-plugin</artifactId>
+        <executions>
+          <execution>
+            <id>checkstyle</id>
+            <configuration>
+              <excludes>**/gaos/**/*.java</excludes>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
       <plugin>
         <groupId>org.jacoco</groupId>
         <artifactId>jacoco-maven-plugin</artifactId>
@@ -456,6 +470,13 @@
           </execution>
         </executions>
       </plugin>
+      <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>animal-sniffer-maven-plugin</artifactId>
+        <configuration>
+          <skip>true</skip>
+        </configuration>
+      </plugin>
     </plugins>
   </build>
   <profiles>