Duplicated identifier when generating a service

[octonato]

I run into this when compiling the ExampeSuite tests we added to the Akka Serverless Java SDK.

We have two tests that define an alternative Empty message. The proto definition uses both and then akka-grpc will generate a service with twice the identified EmptySerializer.

public static class Serializers {

  public static ProtobufSerializer<org.example.service.ServiceOuterClass.MyRequest> MyRequestSerializer = 
    new GoogleProtobufSerializer<>(org.example.service.ServiceOuterClass.MyRequest.parser());
    
  public static ProtobufSerializer<org.external.ExternalDomain.Empty> EmptySerializer = 
    new GoogleProtobufSerializer<>(org.external.ExternalDomain.Empty.parser());
    
  public static ProtobufSerializer<com.google.protobuf.Empty> EmptySerializer = 
    new GoogleProtobufSerializer<>(com.google.protobuf.Empty.parser());
    
  }