[FEATURE] Add a line to the Y-axis.

UI like:

![img_v3_0274_705b52a5-b194-4e58-acf2-e1503dbab8bg](https://github.com/SwanHubX/SwanLab/assets/58305964/7e8c8d40-7171-493c-b412-960a906d3d90)
