feat(picker): 为当前选中的 picker-roller-item 新增类名

[AnxysUaen]

这个 PR 做了什么? (简要描述所做更改)

为 Picker 组件备选项中的当前选中项新增 nut-picker-roller-item-selected 类名，便于为当前项配置自定义样式

这个 PR 是什么类型? (至少选择一个)

• [x] feat: 新特性提交
• [ ] fix: bug 修复
• [ ] docs: 文档改进
• [x] style: 组件样式/交互改进
• [ ] type: 类型定义更新
• [ ] perf: 性能、包体积优化
• [ ] refactor: 代码重构、代码风格优化
• [ ] test: 测试用例
• [ ] chore(deps): 依赖升级
• [ ] chore(demo): 演示代码改进
• [ ] chore(locale): 国际化改进
• [ ] chore: 其他改动（是关于什么的改动？）

这个 PR 涉及以下平台:

• [x] NutUI H5 @nutui/nutui
• [ ] NutUI Taro @nutui/nutui-taro

这个 PR 是否已自测:

• [x] 自测 Vite 脚手架使用 测试仓库
• [ ] 自测 Taro 脚手架使用小程序 & Taro-H5 测试仓库

Summary by CodeRabbit

• 新功能
  • 添加了选择功能，通过当前索引来高亮显示选择项。

[coderabbitai[bot]]

Walkthrough

此更改在Column.vue中引入了一个新函数isCurrPick，用于基于当前索引进行选择高亮显示，并将该函数添加到导出的实体中。

Changes

文件路径	更改摘要
src/packages/.../Column.vue	引入并导出函数isCurrPick

Poem

小兔带来新功能， isCurrPick闪亮舞动。 高亮选中更直观， 列表索引轻松查。 🎉📝✨

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[AnxysUaen]

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