[Merged by Bors] - feat(tactic/positivity): Extension for natural powers in a canonically_ordered_comm_semiring
#17535
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Provide
positivity_canon_pow
, a positivity extension fora ^ n
wherea
is in acanonically_ordered_comm_semiring
. Typically, this applies toennreal
, which is not covered by the existingpositivity_pow
extension.