feat: support input transformations for features #225

Job	Run time
mlr-org/bbotk	8m 48s
mlr-org/mlr3	9m 45s
mlr-org/mlr3tuning	10m 18s
mlr-org/mlr3tuning', 'mlr-org/mlr3learners', 'mlr-org/mlr3pipelines', 'mlr-org/bbotk', 'mlr-org/paradox	9m 42s
	38m 33s

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