🚀[FEA]: Unified config handling

[mnabian]

Is this a new feature, an improvement, or a change to existing functionality?

Improvement

How would you describe the priority of this feature request

Medium

Please provide a clear description of problem you would like to solve.

Currently different examples use different ways of handling configs. Some use hydra, some use pydantic, and some use hydra but with a lot of hard-coded configs in the training script. We need to unify these and change all of the examples to properly use the hydra configs.

Describe any alternatives you have considered

No response