migrated grpc keyword to the newer monitoringtype (#4821)

Co-authored-by: Louis Lam <louislam@users.noreply.github.com>

test/manual-test-grpc/echo.proto

@@ -0,0 +1,7 @@
+syntax = "proto3";
+package echo;
+service EchoService {
+  rpc Echo (EchoRequest) returns (EchoResponse);
+}
+message EchoRequest { string message = 1; }
+message EchoResponse { string message = 1; }

test/manual-test-grpc/simple-grpc-server.js

@@ -0,0 +1,22 @@
+const grpc = require("@grpc/grpc-js");
+const protoLoader = require("@grpc/proto-loader");
+const packageDef = protoLoader.loadSync("echo.proto", {});
+const grpcObject = grpc.loadPackageDefinition(packageDef);
+const { echo } = grpcObject;
+
+/**
+ * Echo service implementation
+ * @param {object} call Call object
+ * @param {Function} callback Callback function
+ * @returns {void}
+ */
+function Echo(call, callback) {
+    callback(null, { message: call.request.message });
+}
+
+const server = new grpc.Server();
+server.addService(echo.EchoService.service, { Echo });
+server.bindAsync("0.0.0.0:50051", grpc.ServerCredentials.createInsecure(), () => {
+    console.log("gRPC server running on :50051");
+    server.start();
+});