feat: port Topology.ContinuousFunction.StoneWeierstrass (#4701)

Author: Ruben-VandeVelde

Mathlib.lean

@@ -2594,6 +2594,7 @@ import Mathlib.Topology.ContinuousFunction.Compact
 import Mathlib.Topology.ContinuousFunction.LocallyConstant
 import Mathlib.Topology.ContinuousFunction.Ordered
 import Mathlib.Topology.ContinuousFunction.Polynomial
+import Mathlib.Topology.ContinuousFunction.StoneWeierstrass
 import Mathlib.Topology.ContinuousFunction.T0Sierpinski
 import Mathlib.Topology.ContinuousFunction.Weierstrass
 import Mathlib.Topology.ContinuousOn