feat(pack): support optimization.removeUnusedExports & codegen modules without module graph

[fireairforce]

Summary

新增一个配置 optimization.removeUnusedExports 用于移除未使用到的导出。该配置在 production 场景下默认开启，dev 场景下默认为 false。

同时 apply turbopack 底层的 export_usage 变更: vercel/next.js#81238

用于节省在 modules 生成时候的内存占用。

Test Plan

参考快照测试的变更

[gemini-code-assist]

Summary of Changes

Hello @fireairforce, 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!

此拉取请求引入了一个新的优化功能，允许用户配置是否移除未使用的导出，从而减小最终打包体积。此功能通过在生产环境中默认启用，而在开发环境中默认禁用，以平衡开发效率和生产性能。同时，它还包含了对 Turbopack 核心导出使用分析机制的底层更新，确保了优化逻辑的正确性和效率。

Highlights

• 新配置项: 新增 optimization.removeUnusedExports 配置，用于移除未使用的导出。此配置在生产环境下默认开启，开发环境下默认关闭。
• Turbopack集成: 集成了 Turbopack 底层的 export_usage 变更，以支持更精细的导出使用分析。
• 重构Chunking Context参数: 重构了 ClientChunkingContext 和 LibraryChunkingContext 的创建函数，将多个参数封装到新的 ClientChunkingContextOptions 和 LibraryChunkingContextOptions 结构体中，提高了代码的可读性和可维护性，并加入了 export_usage 字段。

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[gemini-code-assist]

Code Review

这个 PR 引入了一个很有价值的优化（removeUnusedExports），用于移除未使用的导出，这有助于减小生产环境下的包体积。实现看起来很可靠，并且默认行为（生产环境开启，开发环境关闭）是合理的。将函数参数重构为专门的 Options 结构体（如 ClientChunkingContextOptions 和 LibraryChunkingContextOptions）的做法，对于代码清晰度和可维护性来说是一个巨大的改进，尤其是在 turbo_tasks 框架中。

我提出了一些关于次要重构的建议，以提高代码的清晰度并遵循 Rust 的惯用写法。总的来说，这是一个很棒的贡献。