Debug logs in fetcher/sender, fixed error in HS

Core/Core.cs

@@ -160,7 +160,9 @@ namespace Kruzya.TelegramBot.Core
 
         private void HookAppDomain()
         {
-            AppDomain.CurrentDomain.AssemblyResolve += delegate(object? sender, ResolveEventArgs args)
+            var appDomain = AppDomain.CurrentDomain;
+
+            appDomain.AssemblyResolve += delegate(object? sender, ResolveEventArgs args)
             {
                 var basePath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
                 string assemblyPath = Path.Combine(basePath, new AssemblyName(args.Name).Name + ".dll");

Core/Service/AbstractTimedHostedService.cs

@@ -3,13 +3,14 @@ using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 using BotFramework;
+using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
 using Telegram.Bot.Exceptions;
 using Telegram.Bot.Types;
 
 namespace Kruzya.TelegramBot.Core.Service
 {
-    public abstract class AbstractTimedHostedService
+    public abstract class AbstractTimedHostedService : IHostedService, IDisposable
     {
         private Timer _timer;