[Feature] Enable optional parameters for objective functions with functools about osier HOT 3 OPEN

From a user perspective, I think functools.partial should be abstracted away. Then the user would also not be required to import functools.

Will func1 be passed as is or as a key in its own dict paired with a None value? e.g., func1 or {func1: None}. Consistency with func2 would be nice.

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Thanks @smpark7! This behavior is only for the cases where a function has some additional parameters, which would be ‘func2’ in this case. ‘func1’ is not modified so ‘osier’ can simply use it. This is what I would consider “advanced” usage. I’d rather not complicate the syntax too much by harmonizing the format. 9/10 times users would pass ‘func’:None.

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Okay if that's the case then just func1 is good.

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