added support for web ; bumped dart_core_sdk version to 1.13.2

lib/services/grpc_service.dart

@@ -1,4 +1,5 @@
 import 'package:grpc/grpc.dart';
+import 'package:grpc/grpc_or_grpcweb.dart';
 import 'package:sampleapp/services/auth/auth.dart';
 
 class AuthInterceptor extends ClientInterceptor {
@@ -17,15 +18,19 @@ class AuthInterceptor extends ClientInterceptor {
 }
 
 class GrpcClient {
-  static Client initializeClient(AuthService authService, String host, int port, Client Function(ClientChannel, List<ClientInterceptor>) clientFactory) {
+  static Client initializeClient(
+    AuthService authService,
+    String host,
+    int port,
+    Client Function(GrpcOrGrpcWebClientChannel, List<ClientInterceptor>)
+        clientFactory,
+  ) {
     final interceptor = AuthInterceptor(authService);
-    final channel = ClientChannel(
-      host,
+    final channel = GrpcOrGrpcWebClientChannel.toSingleEndpoint(
+      host: host,
       port: port,
-      options: const ChannelOptions(
-        credentials: ChannelCredentials.secure(),
-      ),
+      transportSecure: true,
     );
     return clientFactory(channel, [interceptor]);
   }
-}
+}