为什么ProTable的search里的submitterColSpanProps里的span属性一定要number类型？

提问前先看看：

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

### 🧐 问题描述

submitterColSpanProps的span设置为number类型后，当页面宽度比较小的时候并在submit区域添加多一个按钮后，submit区域就有可能超出页面

### 💻 示例代码
submit区域有可能超出页面
```
search={{
layout: "horizontal",
optionRender: (searchConfig, props, dom) => [
...dom,
,
,
],
labelWidth: "auto",
collapseRender: false,
collapsed: false,
submitterColSpanProps: { span: 8, flex: "auto" },
}}

```
submit区域可以正常换行
```
search={{
layout: "horizontal",
optionRender: (searchConfig, props, dom) => [
...dom,
,
,
],
labelWidth: "auto",
collapseRender: false,
collapsed: false,
submitterColSpanProps: { span: "auto" as unknown as number, flex: "auto" },
}}
```
### 🚑 其他信息
类型定义
span设置为number超出页面
span设置为auto正常显示

Start at ProTable's search entry point and inspect the type definition for submitterColSpanProps, especially span. Reproduce the supplied narrow-screen example with an added optionRender button, comparing a numeric span with the demonstrated auto value. Done means the submit area can wrap responsively without requiring an unsafe type cast.

Written by the indexing model from the issue text.