[xlang] Cross language Python support (#6709)

python/ray/__init__.py

@@ -107,6 +107,7 @@ from ray._raylet import (
     ObjectID,
     TaskID,
     UniqueID,
+    Language,
 )  # noqa: E402
 
 _config = _Config()
@@ -141,6 +142,7 @@ import ray.projects  # noqa: E402
 import ray.actor  # noqa: F401
 from ray.actor import method  # noqa: E402
 from ray.runtime_context import _get_runtime_context  # noqa: E402
+from ray.cross_language import java_function, java_actor_class  # noqa: E402
 
 # Ray version string.
 __version__ = "0.9.0.dev0"
@@ -182,6 +184,9 @@ __all__ = [
     "shutdown",
     "show_in_webui",
     "wait",
+    "Language",
+    "java_function",
+    "java_actor_class",
 ]
 
 # ID types