Unify general classes argument - `n_classes` vs `num_classes`

[Borda]

Is your feature request related to a problem? Please describe.
it complicated easily mode switching in kind of hyperparameter searches

Describe the solution you'd like
unify n_classes and num_classes across model arguments

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
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