[python-package] add type hints on Booster predict() methods #5749
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Contributes to #3756.
Adds input and return type annotations on
Booster.predict()
and_InnerPredictor.predict()
.Based on these docstrings:
LightGBM/python-package/lightgbm/basic.py
Line 842 in e8cdc2c
LightGBM/python-package/lightgbm/basic.py
Line 3958 in e8cdc2c