[feature] capture FS stats for plugins

[gabrielcsapo]

Currently ember-cli tracks fs stats for plugins by turning on heimdalljs-fs-monitor. It would be great if we could do this without having to be dependent on ember-cli to expose this information in plugin nodes.

https://github.com/ember-cli/ember-cli/blob/627934f91b2aa0e19b041fdb1b547873c1855793/lib/models/instrumentation.js#L17