Add WebSocket support with Jakarta WebSocket integration

- Implemented WebSocketSession abstract class with callback-based API
- Added ServletWebSocketSession with full Jakarta WebSocket bridging
- Created @WebSocket annotation for declarative endpoint marking
- Updated JettyApp to initialize Jakarta WebSocket container
- Split Request/Response into abstract base and servlet implementations
- Moved JettyApp to jabba.servlet package
- Moved annotations to jabba.decor package
- Added comprehensive WebSocket test suite (5 tests, all passing)
- Updated README.md with WebSocket documentation and examples
- All 31 tests passing (async, sync, security, websocket, database)
- Fixed spelling errors in README.md

extra.gradle

@@ -92,16 +92,31 @@ class Server implements Runnable{
     info("stopping server");
     if(driver!=null){
       driver.interrupt();
-      //driver.join();
+      try{
+        driver.join(5000); // Wait up to 5 seconds for graceful shutdown
+      }catch(InterruptedException e){
+        info("interrupted while waiting for driver to stop");
+      }
     }
+    // Clean up stale threads using proper interruption
     for(Thread th:Thread.getAllStackTraces().keySet()){
       if(th.getName().equalsIgnoreCase("executor")){
         info("cleaning up stale driver:"+th.toString())
-        th.stop();
+        th.interrupt();
+        try{
+          th.join(2000); // Wait up to 2 seconds
+        }catch(InterruptedException e){
+          // Ignore
+        }
       }
       if(th.getName().equalsIgnoreCase("server.driver")){
         info("cleaning up stale driver:"+th.toString())
-        th.stop();
+        th.interrupt();
+        try{
+          th.join(2000); // Wait up to 2 seconds
+        }catch(InterruptedException e){
+          // Ignore
+        }
       }
     }
     return this;