Rework parental ratings (#12615)

MediaBrowser.Model/Entities/ParentalRatingEntry.cs

@@ -0,0 +1,22 @@
+using System.Collections.Generic;
+using System.Text.Json.Serialization;
+
+namespace MediaBrowser.Model.Entities;
+
+/// <summary>
+/// A class representing an parental rating entry.
+/// </summary>
+public class ParentalRatingEntry
+{
+    /// <summary>
+    /// Gets or sets the rating strings.
+    /// </summary>
+    [JsonPropertyName("ratingStrings")]
+    public required IReadOnlyList<string> RatingStrings { get; set; }
+
+    /// <summary>
+    /// Gets or sets the score.
+    /// </summary>
+    [JsonPropertyName("ratingScore")]
+    public required ParentalRatingScore RatingScore { get; set; }
+}