Wrap a FrugalBuilder in a watcher instance. Internally, this class will spawn a child deno process in watch mode actually running the FrugalBuilder and the produced instance.

Convenience function building a FrugalBuilder, a FrugalWatcher, and starting the watch process. By default all modules in the dependency graph are watched (see https://deno.land/manual/getting_started/command_line_interface#watch-mode). If you want to watch additionnal files/folders, pass them to the paths option.