added GetVisitorByIdAsync

CRM.Visitors/Managers/Interfaces/IVisitorManager.Async.cs

 {
     public partial interface IVisitorManager : IManager
     {
+        Task<SelectResponse<Infos.Visitor>> GetVisitorByIdAsync(SelectRequest request, long VisitorId);
        Task<SelectResponse<Unibase.Platform.Templates.Infos.PrintTemplate>> GetVisitorshtmlAsync(SelectRequest srequest, long visitorid);
         Task<SelectResponse<Bizgaze.CRM.Visitors.Infos.Visitor>> GetpreVisitorsAsync(SelectRequest srequest, string code);
         Task<ActionResponse<Bizgaze.CRM.Visitors.Infos.Visitor>> VisitorAgreementAsync(ActionRequest arequest, long VisitorId);