Add support for .nfo file metadata

[entropicdrifter]

Is your feature request related to a problem? Please describe.
When trying out Dim with my existing media library, I noticed that many of my shows/films were incorrectly recognized as other pieces of media and, in some cases, were not recognized at all. In my case I already have Jellyfin, Sonarr and Radarr correctly organizing and identifying all of my media for me and saving all of that metadata (and photos) to the same folder as the media files themselves.

Describe the solution you'd like
In cases like mine and for people who use .nfo files for metadata on Kodi already, having Dim auto-detect and source metadata from those nfo files ought to speed up scan speeds and help improve accuracy of scans.

Additional context
This would help lower the cost of switching from other media server solutions, as well as improve integration with tools like Sonarr/Radarr. Ideally, I'd rather not have to go through the song and dance of re-identifying my more obscure pieces of media when the metadata is sitting right next to it on disk