feat: option to disable watcher wher runnig "dart_frog dev"

[Damianoux]

I'd like to use FreeBSD for development. I am able to run "dart_frog build" but not "dart frog dev", because inotify api is missing, i got the error: FileSystemException: Failed to initialize file system entity watcher, path = '/dart_frog/myproject' (OS Error: Function not implemented, errno = 38) Could it be possible to prevent watcher to run when executing "dart pub dev" with a command line option?