Fix #3833: introduce token replace class.

Oqtane.Shared/Interfaces/ITokenSource.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Oqtane.Interfaces
+{
+    public interface ITokenSource
+    {
+        IDictionary<string, object> GetTokens();
+    }
+}