[python-package] add a few type hints in LGBMModel.fit() #6470
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Contributes to #3867
Contributes to #3756
Pulls a function re-defined on every call to
LGBMModel.fit()
up to the module level, and adds type hints, a docstring, and comments to make it easier to understand and to improvemypy
's ability to catch bugs on codepaths that go through it.Resolves this error from
mypy
: