[FEATURE] Adapt Pydantic for handling model configs

[szmazurek]

Is your feature request related to a problem? Please describe.

Currently, model configs are separate classes, where validation of arguments and setting default ones happen manually.

Describe the solution you'd like

The entire config parsing and usage flow could be handled with Pydantic, which would simplify code, perform automatic type validation, and set the defaults. Also, if well prepared, such configs become a source for the easy creation of usage docs for a given module.

Describe alternatives you've considered

N.A

Additional context

Add any other context or screenshots about the feature request here.

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