[依赖优化] Git 依赖会默认克隆所有文件，但是 example 放在依赖仓库有必要吗？

从[这个 issue]知道 git 依赖的方式可以通过指定 shallow-clone 来避免下载所有 git 记录，但是我发现 flutter_boost 中有 example 工程，下面有 180M+ 的图片，这个真的需要吗？

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[这个 issue]: https://github.com/dart-lang/pub/issues/3556

Inspect the flutter_boost repository's example directory and its 180M+ of image assets, then check how the package is consumed as a Git dependency. Done means determining whether those example assets are required and defining a scoped change or documented rationale for the dependency size.

Written by the indexing model from the issue text.