[java] support creating an actor with parameters (#2817)

Previously `Ray.createActor` only support creating an actor without any parameter. This PR adds the support for creating an actor with parameters. Moreover, besides using a constructor, it's now also allowed to create an actor with a factory method. For more usage, prefer refer to `ActorTest.java`.

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

@@ -105,16 +105,6 @@ public final class Ray extends RayCall {
     return runtime.wait(waitList, waitList.size(), Integer.MAX_VALUE);
   }
 
-  /**
-   * Create an actor on a remote node.
-   *
-   * @param actorClass the class of the actor to be created.
-   * @return A handle to the newly created actor.
-   */
-  public static <T> RayActor<T> createActor(Class<T> actorClass) {
-    return runtime.createActor(actorClass);
-  }
-
   /**
    * Get the underlying runtime instance.
    */

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

@@ -52,14 +52,6 @@ public interface RayRuntime {
    */
   <T> WaitResult<T> wait(List<RayObject<T>> waitList, int numReturns, int timeoutMs);
 
-  /**
-   * Create an actor on a remote node.
-   *
-   * @param actorClass the class of the actor to be created.
-   * @return A handle to the newly created actor.
-   */
-  <T> RayActor<T> createActor(Class<T> actorClass);
-
   /**
    * Invoke a remote function.
    *
@@ -78,4 +70,14 @@ public interface RayRuntime {
    * @return The result object.
    */
   RayObject call(RayFunc func, RayActor actor, Object[] args);
+
+  /**
+   * Create an actor on a remote node.
+   *
+   * @param actorFactoryFunc A remote function whose return value is the actor object.
+   * @param args The arguments for the remote function.
+   * @param <T> The type of the actor object.
+   * @return A handle to the actor.
+   */
+  <T> RayActor<T> createActor(RayFunc actorFactoryFunc, Object[] args);
 }