refactor(project): Replace chokidar with @parcel/watcher

Watching a large number of files with chokidar is not efficient,
especially on Windows and slow file systems.

Parcel's watcher is more efficient as it uses a native C++ Node module.

Changing WatchHandler log level to "silly" to avoid duplicate log
entries as BuildServer already logs the events at "verbose" level.

Author: matz3