Rework parental ratings (#12615)

MediaBrowser.Model/Entities/ParentalRatingSystem.cs

@@ -0,0 +1,28 @@
+using System.Collections.Generic;
+using System.Text.Json.Serialization;
+
+namespace MediaBrowser.Model.Entities;
+
+/// <summary>
+/// A class representing a parental rating system.
+/// </summary>
+public class ParentalRatingSystem
+{
+    /// <summary>
+    /// Gets or sets the country code.
+    /// </summary>
+    [JsonPropertyName("countryCode")]
+    public required string CountryCode { get; set; }
+
+    /// <summary>
+    /// Gets or sets a value indicating whether sub scores are supported.
+    /// </summary>
+    [JsonPropertyName("supportsSubScores")]
+    public bool SupportsSubScores { get; set; }
+
+    /// <summary>
+    /// Gets or sets the ratings.
+    /// </summary>
+    [JsonPropertyName("ratings")]
+    public IReadOnlyList<ParentalRatingEntry>? Ratings { get; set; }
+}