Added storage of intent and slot labels inside of the config and did …
@vladgets and/or @tkornuta-nvidia could you please resolve merge conflicts? Hey @okuchaiev  I am not responsible for this PR.

All the TLT-related changes to this model that I need were incorporated in #1477 .

@vladgets it is your shot on what you want to do with this. Since Tomasz did his changes in the code, I will just cancel this PR request.
Added storage of intent and slot labels inside of the config and did correction in prediction function
