enhance ChangeLinkAccount functionality

- Added LoginTypeToBindType function to map login types to binding types.
- Updated ChangeLinkAccount method to handle account linking and unbinding with appropriate error handling.
- Ensured proper messaging for success and failure cases during account changes.
- Cleaned temporary SNS information after account change attempts.

sdk-intergration/Packages/tysdk/Runtime/TYSdkModel.cs

@@ -34,6 +34,13 @@ namespace tysdk
         public Dictionary<string, string> bindInfo;
     }
 
+    public class ChangeLinkResult
+    {
+        public int code;
+        public int userId;
+        public string msg;
+    }
+
     public class LinkCheckInfo
     {
         public int code;