Add Admin Setting , Add new Email Section to Admin

issue : https://sanacommerce.visualstudio.com/Sana%20Projects/_workitems/edit/49417/?triage=true

Ravensburger AG
Ticket 49417: 3.5. ORDER FAILURE – E-MAIL

create ExtendedStoreInfoModel model 

Add property to Web settings 

 public class ExtendedWebsiteSettings : WebsiteSettings

    {

        /// <summary>

        /// [49417] 3.5. ORDER FAILURE – E-MAIL

        /// Gets or sets the 'Orde rFailed Email Address' email address.

        /// </summary>   

        [DataMember]

        public virtual string OrderFailedEmailAddress

        {

            get { return Values.GetValue<string>(Sana.Commerce.Customization.Constants.OrderFailedEmailAddress, "scdemo@sana-commerce.com"); }

            set { Values[Sana.Commerce.Customization.Constants.OrderFailedEmailAddress] = value; }

        }

                

    }