Add type annotations for data module #649

Job	Run time
Detect Changes	8s
constantpredictor/iris	40s
constantpredictor/kc2	2m 53s
constantpredictor/cholesterol	42s
randomforest/iris	1m 7s
randomforest/kc2	1m 10s
randomforest/cholesterol	1m 11s
autogluon/iris	1m 9s
autogluon/kc2	1m 11s
autogluon/cholesterol	1m 10s
autosklearn/iris	1m 12s
autosklearn/kc2	1m 11s
autosklearn/cholesterol	1m 10s
gama/iris	1m 11s
gama/kc2	1m 9s
gama/cholesterol	1m 11s
h2oautoml/iris	1m 11s
h2oautoml/kc2	1m 7s
h2oautoml/cholesterol	1m 6s
mlplanweka/iris	54s
mlplanweka/kc2	1m 9s
mlplanweka/cholesterol	1m 3s
mlr3automl/iris	1m 10s
mlr3automl/kc2	1m 9s
mlr3automl/cholesterol	1m 8s
naiveautoml/iris	1s
naiveautoml/kc2	1s
naiveautoml/cholesterol	59s
tpot/iris	1s
tpot/kc2	1s
tpot/cholesterol	1s
tunedrandomforest/iris	1s
tunedrandomforest/kc2	1s
tunedrandomforest/cholesterol	1s
	29m 29s

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