Add adk module: two LlmAgents in a SequentialAgent with a tool and shared session state on Google ADK for Java 1.11.0

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01RjfyTgmERTWLqzafu34Cth

pom.xml

@@ -15,6 +15,7 @@
     <module>jlama</module>
     <module>onnx-djl</module>
     <module>langgraph4j</module>
+    <module>adk</module>
   </modules>
 
   <properties>
@@ -27,6 +28,7 @@
     <djl.version>0.38.0</djl.version>
     <!-- Verified on Maven Central 2026-10-14 -->
     <langgraph4j.version>1.9.5</langgraph4j.version>
+    <adk.version>1.11.0</adk.version>
     <onnxruntime.version>1.31.0</onnxruntime.version>
     <spring-boot.version>4.1.1</spring-boot.version>
     <junit.version>6.1.3</junit.version>