feat: 树状平铺grid-tree模式，可以在Grid模式下展开/折叠

[Alexzjt]

👀 PR includes

✨ Feature

• New feature 树状平铺grid-tree模式，可以在Grid模式下展开/折叠

🎨 Enhance

• Code style optimization
• Refactoring
• Change the UI
• Improve the performance
• Type optimization

🐛 Bugfix

• Solve the issue and close 🙏透视表平铺模式支持展开收合 #1794

🔧 Chore

• Test case
• Docs / demos update
• CI / workflow
• Release version
• Other ()

📝 Description

🖼️ Screenshot

Before	After
❌	✅

🔗 Related issue link

🔍 Self-Check before the merge

• Add or update relevant docs.
• Add or update relevant demos.
• Add or update test case.
• Add or update relevant TypeScript definitions.

[github-actions]

你好 @Alexzjt，非常感谢你的贡献.
为了让代码更健壮, 请根据 贡献指南 补充相应单元测试 (文档改动或其他特殊场景除外), 如果有 API 改动, 请修改 相应的文档.
同时请检查 lint 和 test 相关 CI 是否通过, 如果失败, 请点击 [Details] 按钮查看, 并根据日志修复.

Hello, @Alexzjt, Thanks for your contribution. In order to make the code more robust, please add the corresponding unit tests, and update the docs if there are API changes.
At the same time, please check whether the CI related to lint and test passes. If the CI fails, please click [Details] button to check and repair according to the log.

[gemini-code-assist]

Summary of Changes

Hello @Alexzjt, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new grid-tree mode to the S2 Pivot Sheet, enhancing the way row headers are displayed. This new mode combines the best of both grid and tree layouts, providing a structured, easy-to-navigate table with the ability to expand and collapse nodes. The changes include modifications to core components, data aggregation logic, and documentation to support and showcase the new feature.

Highlights

• New Feature: Grid Tree Mode: Introduces a new grid-tree hierarchy type for the S2 Pivot Sheet, combining the grid layout with the expand/collapse functionality of tree structures.
• Row Cell Enhancements: Modifies the RowCell component to support the grid-tree mode, including adjustments to bounding box calculations, tree icon display, and content indentation.
• Data Aggregation Logic: Updates the PivotDataSet to use subtotal aggregation logic for collapsed nodes in grid-tree mode, ensuring correct data summarization.
• Documentation and Examples: Adds documentation for the new grid-tree mode and includes a new example to showcase its usage.

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[gemini-code-assist]

Code Review

此拉取请求引入了新的“树状平铺（grid-tree）”模式，它结合了平铺布局和展开/折叠功能。更改包括更新类型定义、在 RowCell 中实现新的渲染逻辑以处理折叠节点、在 PivotDataSet 中处理数据聚合，以及添加新的层级构建器。文档和示例也已相应更新。总体而言，这是一项功能完善且经过深思熟虑的实现。

[codecov-commenter]

Codecov Report

❌ Patch coverage is 69.69697% with 50 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.81%. Comparing base (ecdc9c8) to head (741aba0).
⚠️ Report is 771 commits behind head on next.

Files with missing lines	Patch %	Lines
...core/src/facet/layout/build-grid-tree-hierarchy.ts	74.38%	16 Missing and 15 partials ⚠️
packages/s2-core/src/cell/row-cell.ts	33.33%	6 Missing and 8 partials ⚠️
...s2-core/src/facet/layout/build-header-hierarchy.ts	75.00%	0 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #3299      +/-   ##
==========================================
+ Coverage   75.77%   78.81%   +3.04%     
==========================================
  Files         257      224      -33     
  Lines       11994    12420     +426     
  Branches     2464     2801     +337     
==========================================
+ Hits         9088     9789     +701     
+ Misses       1398      946     -452     
- Partials     1508     1685     +177     

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[github-actions]

Size Change: +1.6 kB (+0.22%)

Total Size: 727 kB

Filename	Size	Change
./packages/s2-core/dist/s2-extends.min.js	207 kB	+148 B (+0.07%)
./packages/s2-core/dist/s2.min.css	581 B	-2 B (-0.34%)
./packages/s2-core/dist/s2.min.js	308 kB	+1.45 kB (+0.47%)

ℹ️ View Unchanged

Filename	Size
./packages/s2-react-components/dist/s2-react-components.min.css	2.55 kB
./packages/s2-react-components/dist/s2-react-components.min.js	123 kB
./packages/s2-react/dist/s2-react.min.css	1.3 kB
./packages/s2-react/dist/s2-react.min.js	38.5 kB
./packages/s2-vue/dist/s2-vue.min.css	2 kB
./packages/s2-vue/dist/s2-vue.min.js	43.6 kB

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