Add differents way to load a model

[ostix360]

Hello,
The only way to load a model is by giving a path but in some situation ( in android with an app) a path don't work.
The thing that can be added is a larger way to load models as whisper.cpp does.

[ggerganov]

Will probably add support in #2398

[ostix360]

ok thanks
I'll take a look