* Added integration addon wit WTelegramBot (WIP)

* Added some extensions methods
* Refactored Result behaviour
* Added missing exception messages
* Removed telegrator-specific host builder (obsolete)
* Code cleanup and bug fixes

src/Telegrator.Hosting/Mediation/HostedUpdateReceiver.cs

@@ -0,0 +1,34 @@
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+using Telegram.Bot;
+using Telegram.Bot.Polling;
+using Telegrator.Core;
+
+namespace Telegrator.Mediation;
+
+/// <summary>
+/// Service for receiving updates for Hosted telegram bots
+/// </summary>
+/// <param name="botClient"></param>
+/// <param name="updateRouter"></param>
+/// <param name="options"></param>
+/// <param name="logger"></param>
+public class HostedUpdateReceiver(ITelegramBotClient botClient, IUpdateRouter updateRouter, IOptions<ReceiverOptions> options, ILogger<HostedUpdateReceiver> logger) : BackgroundService
+{
+    private readonly ReceiverOptions _receiverOptions = options.Value;
+    private readonly IUpdateRouter _updateRouter = updateRouter;
+
+    /// <inheritdoc/>
+    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+    {
+        logger.LogInformation("Starting receiving updates via long-polling");
+        _receiverOptions.AllowedUpdates = _updateRouter.HandlersProvider.AllowedTypes.ToArray();
+
+        botClient.DeleteWebhook(options.Value.DropPendingUpdates, cancellationToken: stoppingToken)
+            .ConfigureAwait(false).GetAwaiter().GetResult();
+
+        DefaultUpdateReceiver updateReceiver = new DefaultUpdateReceiver(botClient, _receiverOptions);
+        await updateReceiver.ReceiveAsync(_updateRouter, stoppingToken).ConfigureAwait(false);
+    }
+}