Go GRPC generator Updates - Fixes #4787 (#4797)

* Fix for #4787

- Updated the grpc generator for go to use full namespace for service
rpc method names

* Formatting Fix

- Set to Google Style Formatting

grpc/src/compiler/go_generator.h

@@ -49,6 +49,9 @@ struct Parameters {
 
   //Package name for the service
   grpc::string package_name;
+
+  //Prefix for RPC Calls
+  grpc::string service_prefix;
 };
 
 // Return the source of the generated service file.