[REWORK] Changes saving client and channel info

Manager.YouTube/YouTubeClientCollection.cs

@@ -0,0 +1,11 @@
+using System.Collections.ObjectModel;
+
+namespace Manager.YouTube;
+
+public class YouTubeClientCollection : KeyedCollection<string, YouTubeClient>
+{
+    protected override string GetKeyForItem(YouTubeClient item)
+    {
+        return item.Id;
+    }
+}