Add generated file

This PR adds generated files under pkg/client and vendor folder.

vendor/google.golang.org/grpc/stats/grpc_testing/test.proto

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+// Copyright 2017 gRPC authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package grpc.testing;
+
+message SimpleRequest {
+  int32 id = 2;
+}
+
+message SimpleResponse {
+  int32 id = 3;
+}
+
+// A simple test service.
+service TestService {
+  // One request followed by one response.
+  // The server returns the client id as-is.
+  rpc UnaryCall(SimpleRequest) returns (SimpleResponse);
+
+  // A sequence of requests with each request served by the server immediately.
+  // As one request could lead to multiple responses, this interface
+  // demonstrates the idea of full duplexing.
+  rpc FullDuplexCall(stream SimpleRequest) returns (stream SimpleResponse);
+
+  // Client stream 
+  rpc ClientStreamCall(stream SimpleRequest) returns (SimpleResponse);
+
+  // Server stream
+  rpc ServerStreamCall(SimpleRequest) returns (stream SimpleResponse);
+}