[w3c/filesystem-api] Provide a API to monitor file/directory change (#7)

It's nice to be able to monitor file/directory change when a filesystem is shared by multiple instances of web app(s). Native apps extensively utilize this feature, and node.js has a (more or less) cross-platform API -- [`fs.watch()`](https://nodejs.org/api/fs.html#fs_fs_watch_filename_options_listener).

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