Add API call for updating stats

[justindhill]

Add API call for updating stats of a song, album, or artist such as play count. Perhaps more depending on how creative we want to get.

[einsteinx2]

Finished the stats API call. Play stats can now be updated, but currently we don't have any API calls to return lists based on that. We can add to the artists, albums, songs, and folders APIs to return most played, recently played, etc.

To handle recently added, we would need to record that timestamp somewhere. Potentially by adding a timestamp to the item table, and querying that.

[einsteinx2]

Added timestamp to item table which is automatically populated when creating an item id

[mdlayher]

This obviously exists now, but are more stats calls needed at this time?