Handle 5002, 5003 and add caches

MediaBrowser.Controller/LiveTv/ISchedulesDirectService.cs

@@ -0,0 +1,17 @@
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace MediaBrowser.Controller.LiveTv;
+
+/// <summary>
+/// Provides Schedules Direct specific operations.
+/// </summary>
+public interface ISchedulesDirectService
+{
+    /// <summary>
+    /// Gets the available countries from the Schedules Direct API, using a file cache.
+    /// </summary>
+    /// <param name="cancellationToken">The cancellation token.</param>
+    /// <returns>The raw JSON response bytes.</returns>
+    Task<byte[]> GetAvailableCountries(CancellationToken cancellationToken);
+}