Add generic callback configuration logic

[PGijsbers]

You can configure callbacks for AutoGluon through configuration, e.g.:

AutoGluonES:
  extends: AutoGluon
  params:
    callbacks:
      EarlyStoppingEnsembleCallback:
        patience: 5

Should probably also be added to the time series script (might be worth at some point trying to see what can be stored in a shared module?)?

[PGijsbers]

@israel-cj I believe this should allow you to specify the callbacks in the way you need to for your experiments, while providing a more general approach for all users.

[Innixma]

LGTM! Thanks for adding. Might be nice if there is some documentation on how to properly specify the callbacks in the yaml file, otherwise it isn't trivial to reverse engineer the proper formatting.