feat(representation_theory/Action): mapping by a monoidal functor (#14331)
feat(representation_theory/Action): mapping by a monoidal functor (#14331)




Co-authored-by: Scott Morrison <63f04b4d96235eb042cc46d94f14d241d2a26722@gmail.com>

leanprover-community/mathlib,leanprover-community/mathlib