🐛[BUG] ProFormSelect 不支持 antd6 api showSearch 的对象写法

https://codesandbox.io/p/devbox/cha-xun-biao-ge-forked-hkpj32

### 🐛 bug 描述

需要的,这是 antd6 写法.

现在的

可见 `showSearch: {
autoClearSearchValue: false,
optionFilterProp: 'label',
}`
这样的写法是不生效的.

### 🏞 期望结果

支持 showSearch 对象写法

### 💻 复现代码
https://codesandbox.io/p/devbox/cha-xun-biao-ge-forked-hkpj32

### © 版本信息

- ProComponents 版本: [e.g. 4.0.0] 3.1.14-6
- umi 版本
- 浏览器环境
- 开发环境 [e.g. mac OS]

Start with the linked CodeSandbox reproduction and trace the ProFormSelect handling of the showSearch prop. Compare the current behavior with the antd 6 object form, especially autoClearSearchValue and optionFilterProp. Done means the object syntax works as expected without breaking existing showSearch usage.

Written by the indexing model from the issue text.