mathlib3

208ebd4e - feat(algebra/order/monoid_lemmas_zero_lt): port some lemmas from `algebra.order.monoid_lemmas` (#12961)

feat(algebra/order/monoid_lemmas_zero_lt): port some lemmas from `algebra.order.monoid_lemmas` (#12961) Although the names of these lemmas are from `algebra.order.monoid_lemmas`, many of the lemmas in `algebra.order.monoid_lemmas` have incorrect names, and some others may not be appropriate. Also, many lemmas are missing in `algebra.order.monoid_lemmas`. It may be necessary to make some renames and additions.