[TS] GRPC Implementation (#6141)

* GRPC implementation for Typescript

* Fixes a couple of issues

* Finished implementing the typescript support for grpc

* Updated generated code

* Fixes CI

grpc/flatbuffers-js-grpc/src/greeter_grpc.js

@@ -0,0 +1,55 @@
+// Generated GRPC code for FlatBuffers TS *** DO NOT EDIT ***
+import { flatbuffers } from 'flatbuffers';
+import *  as Greeter_fbs from './greeter_generated';
+
+var grpc = require('grpc');
+
+function serialize_HelloReply(buffer_args) {
+  if (!(buffer_args instanceof Greeter_fbs.HelloReply)) {
+    throw new Error('Expected argument of type Greeter_fbs.HelloReply');
+  }
+  return buffer_args.serialize();
+}
+
+function deserialize_HelloReply(buffer) {
+  return Greeter_fbs.HelloReply.getRootAsHelloReply(new flatbuffers.ByteBuffer(buffer))
+}
+
+
+function serialize_HelloRequest(buffer_args) {
+  if (!(buffer_args instanceof Greeter_fbs.HelloRequest)) {
+    throw new Error('Expected argument of type Greeter_fbs.HelloRequest');
+  }
+  return buffer_args.serialize();
+}
+
+function deserialize_HelloRequest(buffer) {
+  return Greeter_fbs.HelloRequest.getRootAsHelloRequest(new flatbuffers.ByteBuffer(buffer))
+}
+
+
+var GreeterService = exports.GreeterService = {
+  SayHello: {
+    path: '/Greeter/SayHello',
+    requestStream: false,
+    responseStream: false,
+    requestType: flatbuffers.ByteBuffer,
+    responseType: Greeter_fbs.HelloReply,
+    requestSerialize: serialize_HelloRequest,
+    requestDeserialize: deserialize_HelloRequest,
+    responseSerialize: serialize_HelloReply,
+    responseDeserialize: deserialize_HelloReply,
+  },
+  SayManyHellos: {
+    path: '/Greeter/SayManyHellos',
+    requestStream: false,
+    responseStream: true,
+    requestType: flatbuffers.ByteBuffer,
+    responseType: Greeter_fbs.HelloReply,
+    requestSerialize: serialize_HelloRequest,
+    requestDeserialize: deserialize_HelloRequest,
+    responseSerialize: serialize_HelloReply,
+    responseDeserialize: deserialize_HelloReply,
+  },
+};
+exports.GreeterClient = grpc.makeGenericClientConstructor(GreeterService);