[Feature]: support the rapid creation of monorepo projects

[wangjue666]

What problem does this feature solve?

个人很喜欢之前modern.js的monorepo工程创建， 但是后来开发团队说仅是pnpm的简单封装 所以就把此项功能移除了。

这个功能对于很多开发者来说非常实用，期望rslib开发团队能在未来的更新中重新考虑加入此功能，以便能更好地支持 monorepo 的使用场景。

What does the proposed API look like?

无

[Timeless0911]

The monorepo scenario is not within the scope of Rslib's intended scenario. Rslib focuses on the development of npm libraries. We will provide development guidelines for developing npm libraries in monorepo.

And we have a monorepo engineering solutions in internal, but we have no idea to open source it yet. You can use community solutions such as Nx to create monorepo projects.