Replace mypy-protobuf with protobuf pyi_out

I noticed that pyi_out is a lot cleaner and more readable that mypy-protobuf. Since pyi generation is part of protobuf it is probably prefered instead of unofficial mypy_protobuf.

And there is also one interesting sideeffect that enums constants are not compatible between themselves exposing couple of bugs in our code.

For example:

enum EnumA {
  A_A = 0;
  A_B = 1;
}

enum EnumB {
  B_A = 0;
  B_B = 1;
}

message Msg {
  EnumA name = 1;
}

mypy is not bothered that name can also be used with B_A and B_B. But it works with pyi_out generated code.

Comienza localizando la configuración del repositorio o los scripts que invocan mypy-protobuf e inspecciona cómo se usan los stubs de Python generados. Compara la salida actual con el comportamiento de pyi_out de protobuf y, a continuación, verifica que el reemplazo conserve los stubs esperados y evite que se acepten constantes de enum incompatibles.