[Feature(CLI)] Allow Users to Execute Commands Pre/Post Builds

Hiya 🙋‍♂️,

I really like the Dioxus CLI. it’s quite a handy dandy tool, ngl! However, I’ve noticed it lacks a feature to execute commands pre/post builds. Tools like [Trunk support pre, post and build hooks](https://trunkrs.dev/guide/build/hooks.html), which is super helpful for combining commands.

For example, integrating tailwind cli or the rusty version of it, [railwind](https://github.com/next-rs/next-rs/blob/main/examples/links/Trunk.toml) [(a Rust CLI for compiling Tailwind classes)](https://github.com/pintariching/railwind) into the build process would be helpful. Here's an example use case where running [railwind after the build](https://github.com/next-rs/next-rs/blob/57d7336afc81b2a7bd1db734d9b9285b051a677c/examples/links/Trunk.toml#L4) is useful instead of running a separate watch command.

Adding this feature would enhance the thing and make the CLI even more powerful.

Best