fix:修改在使用分页批量插入时，DmBulkCopy中BatchSize未赋值问题

Src/Asp.NetCore2/SqlSugar/Abstract/FastestProvider/Private.cs

@@ -40,6 +40,7 @@ namespace SqlSugar
                 case DbType.Dm:
                     var result3= new DmFastBuilder();
                     result3.DbFastestProperties.IsOffIdentity = this.IsOffIdentity;
+                    result3.DbFastestProperties.Size = this.Size;
                     return result3;
                 case DbType.ClickHouse:
                     var resultConnectorClickHouse = InstanceFactory.CreateInstance<IFastBuilder>("SqlSugar.ClickHouse.ClickHouseFastBuilder");

Src/Asp.NetCore2/SqlSugar/Entities/DbFastestProperties.cs

@@ -16,5 +16,6 @@ namespace SqlSugar
         public bool IsConvertDateTimeOffsetToDateTime { get; set; }
         public bool NoPage { get; set; }
         public bool IsIgnoreInsertError { get; internal set; }
+        public int Size { get; set; }
     }
 }

Src/Asp.NetCore2/SqlSugar/Realization/Dm/SqlBuilder/DmFastBuilder.cs

@@ -64,6 +64,10 @@ namespace SqlSugar
         {
             DmBulkCopy bulkCopy = GetBulkCopyInstance();
             bulkCopy.DestinationTableName = dt.TableName;
+            if (DbFastestProperties?.Size > 0)
+            {
+                bulkCopy.BatchSize = DbFastestProperties.Size;
+            }
             try
             {
                 bulkCopy.WriteToServer(dt);