[Merged by Bors] - feat(data/finset/noncomm_prod): add noncomm_prod_commute #12521
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adding `list.prod_commute`, `multiset.noncomm_prod_commute` and `finset.noncomm_prod_commute`.
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Co-authored-by: Eric Wieser <wieser.eric@gmail.com>
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adding `list.prod_commute`, `multiset.noncomm_prod_commute` and `finset.noncomm_prod_commute`.
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adding
list.prod_commute,multiset.noncomm_prod_commuteandfinset.noncomm_prod_commute.Instead of a complicated induction over
finsets, I now just prove the lemma for the underlying structures, which is more useful anyways