feat: adaptive情况下的多行布局

[tangying1027]

Checklist

• npm test passes
• tests and/or benchmarks are included
• commit message follows commit guidelines

Description of change

[gemini-code-assist]

Summary of Changes

Hello @tangying1027, 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!

此拉取请求旨在增强图例组件的功能，使其在 adaptive 布局模式下能够支持多行显示。这解决了之前 adaptive 模式下图例只能单行显示的问题，提升了图例在有限空间内的显示灵活性和用户体验。

Highlights

• 多行布局支持: 在 adaptive 布局模式下，图例现在支持多行显示，解决了之前只能单行显示的问题。
• 新增辅助方法: 引入了 getItemBoxes 方法，用于计算并获取图例项的尺寸信息，为多行布局的计算提供支持。
• 测试用例完善: 添加了新的测试用例，专门验证 adaptive 模式下多行图例布局的正确性。

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[gemini-code-assist]

Code Review

本次 PR 实现了图例（Legend）在 adaptive 模式下的多行布局能力，并添加了相应的测试用例，这是一个很棒的功能增强。代码整体实现清晰，但在计算行数的逻辑中存在一个边缘情况处理不当的问题，可能导致行数计算错误，尤其是在图例项宽度大于容器宽度时。我已在具体的代码审查评论中提出了修改建议。

[github-actions]

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
f2/dist/index.js	+0.04%	1,701.25 kB	1,701.98 kB	+0.03%	322.08 kB	322.16 kB
f2/dist/index.min.js	+0.04%	531.16 kB	531.39 kB	+0.05%	159.67 kB	159.75 kB

Significant size changes

Includes any change greater than 0.2%:
(No significant changes)

Generated by 🚫 dangerJS against 5917918