[Sharded-Execution-GRPC] Add GRPC communication for sharded execution. (

aptos-labs#10274)

[Sharded-Execution-GRPC] Add GRPC communication for sharded execution

In this commit we replace the existing socket based communication (that is message send and message recv) with GRPC.
Here we get the basic GRPC reliability.

More reliability and better performance to come in subsequent commits

crates/aptos-protos/proto/aptos/remote_executor/v1/network_msg.proto

@@ -0,0 +1,19 @@
+// Copyright © Aptos Foundation
+// SPDX-License-Identifier: Apache-2.0
+
+syntax = "proto3";
+
+package aptos.remote_executor.v1;
+
+message NetworkMessage {
+    bytes message = 1;
+    string message_type = 2;
+}
+
+message Empty {
+
+}
+
+service NetworkMessageService {
+    rpc SimpleMsgExchange(NetworkMessage) returns (Empty);
+}