- 增加 Repository/DbContext SaveMany 方法实现一对多，子数据的完整保存；

- 调整 SaveManyToMany 方法名为 SaveMany；

FreeSql.DbContext/Repository/Repository/BaseRepository.cs

@@ -130,9 +130,9 @@ namespace FreeSql
             return entity;
         }
 
-        public void SaveManyToMany(TEntity entity, string propertyName)
+        public void SaveMany(TEntity entity, string propertyName)
         {
-            _dbset.SaveManyToMany(entity, propertyName);
+            _dbset.SaveMany(entity, propertyName);
             _db.SaveChanges();
         }
     }