Added GLOBAL_GRPC_OPTIONS to Ray Client GRPC_OPTIONS (ray-project#40490)

GRPC options of the client now extends the GLOBAL_GRPC_OPTIONS constant. Doing so allows the Ray client to obey the expected http/s proxy behaviour. Also gives the user to override this behaviour with the RAY_grpc_enable_http_proxy environment variable.

python/ray/util/client/common.py

@@ -14,6 +14,7 @@
 import ray._raylet as raylet
 import ray.core.generated.ray_client_pb2 as ray_client_pb2
 import ray.core.generated.ray_client_pb2_grpc as ray_client_pb2_grpc
+from ray._private import ray_constants
 from ray._private.inspect_util import (
     is_class_method,
     is_cython,
@@ -65,6 +66,7 @@
 GRPC_KEEPALIVE_TIMEOUT_MS = 1000 * 600
 
 GRPC_OPTIONS = [
+    *ray_constants.GLOBAL_GRPC_OPTIONS,
     ("grpc.max_send_message_length", GRPC_MAX_MESSAGE_SIZE),
     ("grpc.max_receive_message_length", GRPC_MAX_MESSAGE_SIZE),
     ("grpc.keepalive_time_ms", GRPC_KEEPALIVE_TIME_MS),