refactor:完成重构设备的添加，删除，更新。

DMS.WPF/Interfaces/IVariableTableViewService.cs

@@ -0,0 +1,18 @@
+using System.Collections.ObjectModel;
+using DMS.Application.DTOs;
+using DMS.Core.Models;
+using DMS.WPF.ItemViewModel;
+
+namespace DMS.WPF.Interfaces;
+
+public interface IVariableTableViewService
+{
+
+    void LoadAllVariableTables();
+
+    Task<int> AddVariableTable(VariableTable variableTable,
+                                MenuBean menu = null, bool isAddDb = false);
+
+    Task<bool> UpdateVariableTable(VariableTableItem variableTable);
+    Task<bool> DeleteVariableTable(VariableTableItem variableTable, bool isDeleteDb = false);
+}