This commit adds support for "--watch" flag for "bundle"
and "fmt" subcommands.
In addition to this, it refactors "run --watch" command so that
module resolution will occur every time the file watcher detects
file addition/deletion, which allows the watcher to observe a file
that is newly added to the dependency as well.
This commit rewrites file watcher used with --watch flag.
Instead of creating new watcher after each restart, only a single
watcher is created for whole process. Additionally debouncing
mechanism has been added to prevent infinite restart loops
if multiple files were changed in quick succession.
Co-authored-by: bartossh <lenart.consulting@gmail.com>
