[Java] add exitActor API for java (#10496)

java/api/src/main/java/io/ray/api/Ray.java

@@ -241,4 +241,16 @@ public final class Ray extends RayCall {
       PlacementStrategy strategy) {
     return runtime.createPlacementGroup(bundles, strategy);
   }
+
+  /**
+   * Intentionally exit the current actor.
+   * <p>
+   * This method is used to disconnect an actor and exit the worker.
+   *
+   * @throws RuntimeException An exception is raised if this is a driver or this  worker is not
+   *                          an actor.
+   */
+  public static void exitActor() {
+    runtime.exitActor();
+  }
 }

java/api/src/main/java/io/ray/api/runtime/RayRuntime.java

@@ -193,4 +193,9 @@ public interface RayRuntime {
    * @return The wrapped callable.
    */
   <T> Callable<T> wrapCallable(Callable<T> callable);
+
+  /**
+   * Intentionally exit the current actor.
+   */
+  void exitActor();
 }