feat: port Data.Fintype.Card (#1668)

Co-authored-by: ChrisHughes24 <chrishughes24@gmail.com>

Author: jcommelin

Mathlib.lean

@@ -254,6 +254,7 @@ import Mathlib.Data.Finset.Prod
 import Mathlib.Data.Finset.Sigma
 import Mathlib.Data.Finset.Sum
 import Mathlib.Data.Fintype.Basic
+import Mathlib.Data.Fintype.Card
 import Mathlib.Data.Fintype.List
 import Mathlib.Data.Fintype.Pi
 import Mathlib.Data.Fintype.Sigma