[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/package.json

@@ -0,0 +1,9 @@
+{
+  "name": "flatbuffers-js-grpc",
+  "version": "1.0.0",
+  "author": "mustii@mmk.one",
+  "dependencies": {
+    "flatbuffers": "^1.12.0",
+    "grpc": "^1.24.3"
+  }
+}