Support for custom (converted) whisper.cpp format

[acul3]

hi..first of all... awesome apps

AFAIK, right now only "official" whisper.cpp model supported in app.

It would be really great if we can specify/load any custom whisper.cpp converted format

this will speedup performance for huggingface finetuned model(since we can convert it to whisper.cpp)

workaround attemp: i tried to replace the official whisper model with my custom model on cache files but the app keep downloading

thank you