fix validation fraction api#407
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Implemented issue to close #402 by fixing API parity for validation-based early stopping in classification.
What changed
Added validation_fraction and early_stopping_rounds to
NGBClassifier.__init__and forwarded both to NGBoost.Added regression test
test_classifier_validation_fraction_is_supportedto ensure classifier accepts these params, exposes them viaget_params(), and trains/predicts with validation-split early stopping enabled.