[Merged by Bors] - feat(algebra/graded_monoid): add lemmas about power and product membership #10627
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This adds:
set_like.graded_monoid.pow_mem
set_like.graded_monoid.list_prod_map_mem
set_like.graded_monoid.list_prod_of_fn_mem
It doesn't bother to add the multiset and finset versions for now, because these are not imported at this point, and require the ring to be commutative.
I think