Unify the arguments of `OptunaSearchCV` and scikit learn's `GridSearchCV`

[nzw0301]

Motivation

In my understanding, OptunaSearchCV is inspired by GridSearchCV's interface to replace grid search in scikit-learn with Optuna's parameter search.

I realised that the current arguments of OptunaSearchCV were not the same as GridSearchCV:

• the order of arguments differ
• GridSearchCV uses keyword-only arguments, but OptunaSearchCV does not.

Description

Update the arguments of OptunaSearchCV to follow GridSearchCV for consistency.

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[nzw0301]

#4336 partially addresses this issue

#4336 doesn't include scoring and refit because following sklearn's implementation requires a lot of work, according to the previous attempt. Inconsistent argument ordering with sklearn's searchcv also remains to reduce review cost.

[nzw0301]

My attempt for scoring and refit is https://github.com/nzw0301/optuna/tree/prototypo-scoring. Still WIP, but it might not be too hard as I expected.

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This issue was closed automatically because it had not seen any recent activity. If you want to discuss it, you can reopen it freely.