feat: port Order.Filter.Pointwise (#1839)

Co-authored-by: ChrisHughes24 <chrishughes24@gmail.com>
Co-authored-by: Johan Commelin <johan@commelin.net>

Author: 3 people

Mathlib.lean

@@ -746,6 +746,7 @@ import Mathlib.Order.Filter.Lift
 import Mathlib.Order.Filter.ModEq
 import Mathlib.Order.Filter.NAry
 import Mathlib.Order.Filter.Pi
+import Mathlib.Order.Filter.Pointwise
 import Mathlib.Order.Filter.Prod
 import Mathlib.Order.Filter.SmallSets
 import Mathlib.Order.Filter.Ultrafilter