mathlib3

2ecf4800 - feat(algebra/group/units): generalize `units.coe_lift` (#11057)

feat(algebra/group/units): generalize `units.coe_lift` (#11057) * Generalize `units.coe_lift` from `group_with_zero` to `monoid`; use condition `is_unit` instead of `≠ 0`. * Add some missing `@[to_additive]` attrs.