fix: incorrect chunk size map

[xusd320]

1. 修复 optimize_chunk 阶段的 chunk_size_map 计算逻辑。之前对于所有不在 node_modules 下的文件，会全部计入到 “unknown” 的 chunk size 里去，导致计算 chunk 的 total_size 不准确；
2. 添加 code-splitting.many-pages 用例，参考自 webpack/examples/many-pages 。该用例需将页面公共依赖分别拆分打进独立 chunk，在本 PR 之前，mako 无法通过配置实现同等效果。

Summary by CodeRabbit

• 新功能
  • 在应用程序中添加了代码拆分功能。
• 文档
  • 为多页面应用程序中的代码拆分配置文件mako.config.json添加了配置设置。
• 页面更新
  • 更新了多页面应用程序中的各个页面文件，引入了不同的模块和共享文件。

[coderabbitai]

漫游

这次变更集中在代码拆分和优化上，涉及到 mako crate 中 optimize_chunk.rs 文件的重构，以及多页面应用中的模块拆分和配置更新。文件间的依赖关系和拆分逻辑得到了调整，以提高构建结果的效率和可维护性。

变更

文件	摘要
mako/src/generate/optimize_chunk.rs	优化 Compiler 实现逻辑，调整 package_json() 方法返回值
code-splitting.many-pages/expect.js code-splitting.many-pages/pages/a.js code-splitting.many-pages/pages/b.js	引入模块导入和共享文件，验证拆分结果
code-splitting.many-pages/mako.config.json	多页面应用的代码拆分配置
node_modules/m*.js	新增 npm 模块文件，输出简单信息
stuff/s*.js	新增共享文件，输出模块信息

诗篇

共享模块相依连，构建结果显光辉。
优化代码拆分心，兔子欢舞情。 🐇📦

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