[api] API deprecations and cleanups for 1.0 (internal_config and Checkpointable actor) (#10333)

* remove

* internal config updates, remove Checkpointable

* Lower object timeout default

* remove json

* Fix flaky test

* Fix unit test

streaming/java/streaming-api/src/main/java/io/ray/streaming/api/context/ClusterStarter.java

@@ -69,7 +69,7 @@ class ClusterStarter {
         "--load-code-from-local",
         "--include-java",
         "--java-worker-options=" + workerOptions,
-        "--internal-config=" + new Gson().toJson(config)
+        "--system-config=" + new Gson().toJson(config)
     );
     if (!executeCommand(startCommand, 10)) {
       throw new RuntimeException("Couldn't start ray cluster.");

streaming/python/tests/test_hybrid_stream.py

@@ -35,9 +35,7 @@ def test_hybrid_stream():
         load_code_from_local=True,
         include_java=True,
         java_worker_options=java_worker_options,
-        _internal_config=json.dumps({
-            "num_workers_per_process_java": 1
-        }))
+        _system_config={"num_workers_per_process_java": 1})
 
     sink_file = "/tmp/ray_streaming_test_hybrid_stream.txt"
     if os.path.exists(sink_file):