feat(group_theory/subgroup/basic): Add `map_is_commutative` and `comap_injective_is_commutative` (#16109)
feat(group_theory/subgroup/basic): Add `map_is_commutative` and `comap_injective_is_commutative` (#16109)

This PR adds `map_is_commutative` and `comap_injective_is_commutative`.





leanprover-community/mathlib,leanprover-community/mathlib