Unified config interface for all algorithms

[SkBlaz]

By just specifying the algorithm alongside its hyperparameters in a single struct, it should be simpler to explore different configurations (HPOs) for algorithms. Something along the lines of

--heuristic_config {"algorithm":` "MutualInformation", "executor": "numba", "hp_sparsity": 0.2, "hp_randomized": True}

Side effect - simplification of existing algo-decision process/parsing.

[SkBlaz]

@bmramor wdyt about this one, shall we get it operational?