Add Saveable async methods

Src/Asp.Net/SqlSugar/Abstract/SaveableProvider/SaveableProvider.cs

@@ -80,6 +80,7 @@ namespace SqlSugar
             }
         }
 
+        #region Core
         public int ExecuteCommand()
         {
             LoadInsertable();
@@ -118,6 +119,23 @@ namespace SqlSugar
                 updateable.ExecuteCommand();
             return saveObjects;
         }
+        #endregion
+        #region Core Async
+        public Task<int> ExecuteCommandAsync()
+        {
+            return Task.FromResult(ExecuteCommand());
+        }
+
+        public Task<T> ExecuteReturnEntityAsync()
+        {
+            return Task.FromResult(ExecuteReturnEntity());
+        }
+
+        public Task<List<T>> ExecuteReturnListAsync()
+        {
+            return Task.FromResult(ExecuteReturnList());
+        }
+        #endregion
         public ISaveable<T> InsertColumns(Expression<Func<T, object>> columns)
         {
             LoadInsertable();

Src/Asp.Net/SqlSugar/Interface/ISaveable.cs

@@ -3,11 +3,16 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
 using System.Text;
+using System.Threading.Tasks;
 
 namespace SqlSugar
 {
     public partial interface ISaveable<T> where T : class, new()
     {
+        Task<int> ExecuteCommandAsync();
+        Task<T> ExecuteReturnEntityAsync();
+
+        Task<List<T>> ExecuteReturnListAsync();
         int ExecuteCommand();
         T ExecuteReturnEntity();
         List<T> ExecuteReturnList();