'Watching' mode addition for `subo dev`

[hola-soy-milk]

Currently to develop a bundle locally, I'll build it with subo build, and then run it with subo dev.

If I make a change, I'll have to rebuild it with subo build and then re-run subo dev.

Would it be possible to have a subo watch that automatically rebuilds the bundle when it changes and restarts the instance?

(Thank you @flaki for helping clarify!)