feat: add react-native streams support (#55)

This PR adds the `stream` function to the React-Native gRPC transport.
Because the `fetch` API is not fully implemented in React-Native (see
issue [here](facebook/react-native#27741)), I
had to polyfill the missing `fetch` function (package
[here](https://github.com/react-native-community/fetch)) and replaced
some functions in the global namespace (see
[here](https://github.com/acostalima/react-native-polyfill-globals)).

On Android, text-streaming doesn't work out-of-the-box on the `debug`
variant. One solution is to comment the `NetworkFlipperPlugin` (see
[here](react-native-community/fetch#13 (comment))).
Because we don't use it for the moment, I commented that plugin.

I added a `HelloStream` API function to test the stream feature.
We can call it in Reac-Native by doing this:
```typescript
for await (const res of clientInstance.helloStream(new HelloStreamRequest({ name: 'd4ryl00' }))) {
  console.log(res.greeting);
}
```

Signed-off-by: D4ryl00 <[email protected]>

gen.sum

@@ -1,6 +1,6 @@
 ceb2922aa6e25cc4b9256163c5a31443770af3a6  Makefile
 3f8e7619fa38e476bb3d35923f6c2676cfe8809b  buf.gen.yaml
-8e0d611d49279bc49aa043c5f518326b50dfd76c  service/gnomobiletypes/gnomobiletypes.go
-50596a8d996f91253ef714fe24b618f05a6f179a  service/gnomobiletypes/package.go
-cc43128277f99518087578f22e7e56a3de0c0f1f  service/rpc/gnomobiletypes.proto
-5cf0c76d7a484f82c7c56834983dba63286916f7  service/rpc/rpc.proto
+781263c443b6ffebe091128855ce2a8b594fd8ea  service/gnomobiletypes/gnomobiletypes.go
+c4488aa6a301b2865856719295d704c77ff45512  service/gnomobiletypes/package.go
+646d974f3a99753ed94a3d8ba4affb2a0267d3f2  service/rpc/gnomobiletypes.proto
+7b283a24b6c14a7e8907d5b82c95f6ffec4b0332  service/rpc/rpc.proto

gnoboard/App.tsx

@@ -1,5 +1,10 @@
-import CustomRouter from '@gno/router/custom-router';
-import 'fast-text-encoding';
+import CustomRouter from "@gno/router/custom-router";
+import "react-native-polyfill-globals/auto";
+
+// Polyfill async.Iterator. For some reason, the Babel presets and plugins are not doing the trick.
+// Code from here: https://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-3.html#caveats
+(Symbol as any).asyncIterator = Symbol.asyncIterator ||
+  Symbol.for("Symbol.asyncIterator");
 
 function App() {
   return <CustomRouter />;

gnoboard/android/app/src/debug/java/land/gno/gnoboard/ReactNativeFlipper.java

@@ -38,15 +38,16 @@ public static void initializeFlipper(Context context, ReactInstanceManager react
       client.addPlugin(new SharedPreferencesFlipperPlugin(context));
       client.addPlugin(CrashReporterPlugin.getInstance());
 
-      NetworkFlipperPlugin networkFlipperPlugin = new NetworkFlipperPlugin();
-      NetworkingModule.setCustomClientBuilder(
-          new NetworkingModule.CustomClientBuilder() {
-            @Override
-            public void apply(OkHttpClient.Builder builder) {
-              builder.addNetworkInterceptor(new FlipperOkhttpInterceptor(networkFlipperPlugin));
-            }
-          });
-      client.addPlugin(networkFlipperPlugin);
+      // Need to comment this code to allow gRPC streams to work: https://github.com/react-native-community/fetch/issues/13#issuecomment-1703097655
+//      NetworkFlipperPlugin networkFlipperPlugin = new NetworkFlipperPlugin();
+//      NetworkingModule.setCustomClientBuilder(
+//          new NetworkingModule.CustomClientBuilder() {
+//            @Override
+//            public void apply(OkHttpClient.Builder builder) {
+//              builder.addNetworkInterceptor(new FlipperOkhttpInterceptor(networkFlipperPlugin));
+//            }
+//          });
+//      client.addPlugin(networkFlipperPlugin);
       client.start();
 
       // Fresco Plugin needs to ensure that ImagePipelineFactory is initialized