feat: support rowspan expanded

[crazyair]

Summary by CodeRabbit

• 新功能
  • 新增了“expandedRowSpan”演示页面，展示表格行合并与可展开行的用法示例。
  • 新增了“expandedSticky”演示页面，展示带有粘性列和可展开行的表格示例。
• 文档
  • 增加了“expandedRowSpan.md”和“expandedSticky.md”文档，包含相关代码演示。
• 修复
  • 优化了表格在行合并与行展开同时使用时的表现，确保合并单元格能正确适应展开行。
  • 调整展开行宽度计算，提升展开内容显示的准确性。

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[coderabbitai[bot]]

"""

Walkthrough

此次更改引入了一个新的“expandedRowSpan”演示文档及相关 React 代码示例，展示了带有可展开行和自定义行合并（rowSpan）功能的表格。同时，核心表格组件逻辑被增强，以支持在行展开时动态调整单元格的 rowSpan 属性，并在数据结构中显式维护 rowKey。

Changes

文件路径分组	变更摘要
docs/demo/expandedRowSpan.md	新增文档页面“expandedRowSpan”，配置导航元数据，并嵌入了代码示例。
docs/examples/expandedRowSpan.tsx	新增 React 代码示例，演示 rc-table 结合可展开行与自定义 rowSpan 的用法，包含列定义、动态 rowSpan 逻辑、可展开行渲染及样式引入。导出默认组件 Demo。
docs/demo/expandedSticky.md	新增文档页面“expandedSticky”，配置导航元数据，并嵌入了对应的代码示例。
docs/examples/expandedSticky.tsx	新增 React 代码示例，演示带有可展开行和固定列（sticky）的表格，包含列定义、展开行状态管理及渲染。导出默认组件 Demo。
src/Body/BodyRow.tsx	BodyRowProps 接口新增 rowKeys 属性，getCellProps 函数和 BodyRow 组件均支持 rowKeys。getCellProps 内部根据 expandedKeys 动态调整 rowSpan，确保单元格在行展开时正确合并。渲染时改用 memoized 的列数据，提升效率。
src/Body/index.tsx	重构数据处理逻辑：通过 useFlattenRecords 生成的 flattenData 提取 rowKey 数组 rowKeys。渲染 BodyRow 时传递 rowKey 及 rowKeys，简化 key 处理。
src/hooks/useFlattenRecords.ts	FlattenData 接口及相关数据结构新增 rowKey 属性，确保每个扁平化数据项都显式携带其唯一 key。
src/VirtualTable/VirtualCell.tsx	VirtualCell 组件调用 getCellProps 时增加空数组参数，未影响其他逻辑。
src/Body/ExpandedRow.tsx	ExpandedRowProps 接口新增可选属性 offsetWidth。ExpandedRow 组件中调整宽度计算，减去 offsetWidth 以适配额外的水平偏移。
src/Table.tsx	Table 组件中将 classNames 和 styles 加入 TableContextValue 的依赖数组，确保上下文更新。
src/context/TableContext.tsx	将 TableProps 改为类型导入，明确仅用于类型注解，无运行时影响。
src/Panel/index.tsx	Panel 组件的 JSX 返回格式由单行改为多行，功能无变更。
tests/Expanded.spec.tsx	新增测试套件验证表格展开行与 rowSpan 结合的渲染行为，模拟 DOM 属性，断言单元格的 rowSpan 和 colSpan 正确应用。

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant DemoPage
    participant DemoComponent
    participant Table
    participant BodyRow

    User->>DemoPage: 访问 expandedRowSpan 演示页
    DemoPage->>DemoComponent: 渲染 Demo 组件
    DemoComponent->>Table: 渲染带有 columns/data/expandable 的表格
    Table->>BodyRow: 传递 rowKeys, rowKey, columns, expandedKeys 等
    BodyRow->>getCellProps: 计算每个单元格的 rowSpan（考虑展开行）
    getCellProps-->>BodyRow: 返回调整后的单元格属性
    BodyRow-->>Table: 渲染行
    Table-->>DemoComponent: 渲染完整表格

Possibly related PRs

• react-component/table#1210: 该 PR 也涉及 BodyRow 的 rowKeys 属性调整，虽然关注点不同，但在组件接口层面相关。

Suggested reviewers

• zombieJ
• afc163

Poem

兔子跳跃新功能，
表格行合并真灵活。
展开收起随心意，
rowKey 明确不迷离。
文档示例齐上阵，
代码世界更精彩！
🐇✨ """

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.12%. Comparing base (d696f75) to head (dc67020).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1278      +/-   ##
==========================================
+ Coverage   98.08%   98.12%   +0.03%     
==========================================
  Files          77       78       +1     
  Lines        7609     7771     +162     
  Branches     1164     1194      +30     
==========================================
+ Hits         7463     7625     +162     
  Misses        140      140              
  Partials        6        6              

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