[swig] add wrapper for LGBM_DatasetGetFeatureNames (#4103)
[swig] add wrapper for LGBM_DatasetGetFeatureNames (#4103)


henry0312/LightGBM,henry0312/LightGBM,henry0312/LightGBM,henry0312/LightGBM,microsoft/LightGBM,henry0312/LightGBM,microsoft/LightGBM,microsoft/LightGBM,microsoft/LightGBM,microsoft/LightGBM