Feature/chore: Implement fullPath.

[ryan-roemer]

There are a number of issues related to the fact that the stats object doesn't have the actual full path on disk of modules. Instead we get identifier and some other stuff that we can loosely infer stuff with.

In addition to the various tickets out there, this is a tracking ticket to allow a lot of TODOs that should be searched on in source to fix before shipping the feature.