Implement cross-validation examples for Optuna Terminator 🤖

[g-votte]

Optuna Terminator is a new feature planned to be introduced in the upcoming minor release, Optuna v3.2.

In particular, it is expected to help mitigate excessive resource usage and hyperparameter overfitting in cross-validation scenarios.

This issue aims to create example code demonstrating the usage of Optuna Terminator with ML libraries that support cross-validation. For instance:

• scikit-learn
• LightGBM
• XGBoost
• CatBoost

[nzw0301]

~Is there an official document for this feature? It would be great to refer to the docs for contributors working on this issue.~

Docs will be available soon: https://github.com/optuna/optuna/issues/4598

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