feat: add global __mako_chunk_load__

[sorrycc]

Summary by CodeRabbit

• Bug Fixes

  • 在构建过程中修改了处理临时目录创建和删除逻辑，现在在尝试删除临时目录之前会检查其是否存在。
    • 在 build.js 中，fs.rmdirSync(path.join(root, 'tmp'), { recursive: true }); 被替换为：
      • let tmpDir = path.join(root, 'tmp');
      • if (fs.existsSync(tmpDir)) {
      • fs.rmdirSync(tmpDir, { recursive: true });
    • 在 build.js 中，fs.mkdirSync(path.join(root, 'tmp')); 被替换为：
      • fs.mkdirSync(tmpDir);

• New Features

  • 在 app_runtime.stpl 文件中添加了一个新的全局变量 __mako_chunk_load__，并赋予其值 requireModule.ensure。
    • global.__mako_chunk_load__ = requireModule.ensure 添加在 crates/mako/templates/app_runtime.stpl

[coderabbitai]

摘要

### 漫游
这次更新涉及到两个主要更改：
1. 在 `app_runtime.stpl` 文件中添加了一个新的全局变量 `__mako_chunk_load__`，赋值为 `requireModule.ensure`。
2. 在 `build.js` 文件中修改了处理构建过程中临时目录创建和删除逻辑，现在会在尝试删除临时目录之前检查其是否存在。

### 更改
| 文件路径                                | 更改摘要                                                                                                                                                                                                                                                                                                                                                                                |
|---------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| crates/mako/templates/app_runtime.stpl | 添加了 `global.__mako_chunk_load__ = requireModule.ensure`                                                                                                                                                                                                                                                                                                                            |
| examples/rsc/build.js                 | - 修改了临时目录的处理逻辑，现在会在尝试删除临时目录之前检查其是否存在。<br>- `fs.rmdirSync(path.join(root, 'tmp'), { recursive: true });` →<br>  - `let tmpDir = path.join(root, 'tmp');`<br>  - `if (fs.existsSync(tmpDir)) {`<br>  - `fs.rmdirSync(tmpDir, { recursive: true });`<br>- `fs.mkdirSync(path.join(root, 'tmp'));` →<br>  - `fs.mkdirSync(tmpDir);` |

诗

代码改动如诗般细腻，兔子在键盘上跳跃；
临时目录不再迷惑，新变量在文件中崭露。 🐇✨

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