REV: revert tuple/list return type changes for *split
functions
#25800
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This reverts a part of gh-25570. It turns out that the
split
functions are exceptional, and returning a tuple of arrays isn't better (perhaps worse) for Numba. For JAX it didn't matter. Given there's certainly no gain, we decided in the post-merge discussion on gh-25570 to revert the changes to thesplit
APIs.