Support Nemotron for Dictation() with Kaldi backend

[kendonB]

I have got a simple Nemotron ASR pipeline working (remote linux server with an RTX5090, Windows client) and it's pretty fast and quite accurate.

It would be good to incorporate as a Dictation option for the Kaldi backend.

[kendonB]

Actually this is probably doable using AlternativeDictation. I will try to add an example