Fix column order issue in cast #684
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Previously, the order of the columns in the features passes to
cast_mattered.However even though features passed to
cast_had the same order as the dataset features, it could fail because the schema that was built was always in alphabetical order.This issue was reported by @lewtun in #623
To fix that I fixed the schema to follow the order of the arrow table columns.
I also added the possibility to give features that are not ordered the same way as the dataset features.