👑 [需求] How can we add custom theme Icon in SettingDrawer?

提问前先看看：

https://github.com/ryanhanwu/How-To-Ask-Questions-The-Smart-Way/blob/main/README-zh_CN.md

**🔩 Module or component**
**In SettingDrawer**

**🥰 Requirement Description**

I want to add a custom theme icon in the SettingDrawer to change the theme, like this.
n

In the picture above, there are three themes. I am trying to add a third custom theme in addition to the light and dark themes. How can I achieve this? I didn't find any such type of SettingDrawer props.

I'm using these versions

```json
"@ant-design/pro-layout": "7.19.11",
"antd": "^5.14.0",
```

Start with the SettingDrawer component and its props in @ant-design/pro-layout 7.19.11; inspect the existing theme controls and related documentation. Verify whether a third theme and custom icon can be configured, then document the supported approach or limitation with an example.

Written by the indexing model from the issue text.