feat: port Data.Set.Pointwise.Basic (#1188)

- [x] depends on: leanprover-community/batteries#83
- [x] depends on: leanprover-community/aesop#38
- [x] depends on: #1447

Co-authored-by: ChrisHughes24 <chrishughes24@gmail.com>
Co-authored-by: Ruben Van de Velde <65514131+Ruben-VandeVelde@users.noreply.github.com>
Co-authored-by: Johan Commelin <johan@commelin.net>

Author: 4 people

Mathlib.lean

@@ -356,6 +356,7 @@ import Mathlib.Data.Set.Lattice
 import Mathlib.Data.Set.NAry
 import Mathlib.Data.Set.Opposite
 import Mathlib.Data.Set.Pairwise
+import Mathlib.Data.Set.Pointwise.Basic
 import Mathlib.Data.Set.Prod
 import Mathlib.Data.Set.Sigma
 import Mathlib.Data.Set.UnionLift