Fix: json: cannot unmarshal array into Go struct field Metadata.MediaContainer.Metadata.rating of type float64

[mdisibio]

Getting an error on Plex 1.27.1.5916 json: cannot unmarshal array into Go struct field Metadata.MediaContainer.Metadata.rating of type float64 during GetSessions().

It seems that there is a new json field Rating that conflicts with the (deprecated?) existing rating which is float64. An example response looks like this (trimmed for clarity):

{
    "MediaContainer": {
        "size": 1,
        "Metadata": [
            {
                "parentTitle": "Season 6",
                "ratingKey": "5417",
                "sessionKey": "48",

                "Rating": [
                    {
                        "image": "themoviedb://image.rating",
                        "type": "audience",
                        "value": "7.7"
                    }
                ],

There is no float64 rating, but the new Rating array. Golang json unmarshalling attempts case-sensitive field match first, but falls back to case-insensitive and ends up colliding with rating.

This fix introduces a new Rating struct and the case-sensitive json name, however the go-field is Ratings to not conflict with the existing Rating float64.