* Added Result class to communicate with router from handler

* Removed "ExecuteOnlyFirstFoundHanlder" in sake of testing new Result pattern based routing system
* Removed obsolete option property "DescendDescriptorIndex"
* Changed router logic
* Changed handlers pool logic

Telegrator.Tests/TestUpdateHandler.cs

@@ -13,11 +13,11 @@ namespace Telegrator.Tests
     {
         public bool WasExecuted { get; private set; }
 
-        public override Task Execute(IAbstractHandlerContainer<Message> container, CancellationToken cancellationToken)
+        public override Task<Result> Execute(IAbstractHandlerContainer<Message> container, CancellationToken cancellationToken)
         {
             cancellationToken.ThrowIfCancellationRequested();
             WasExecuted = true;
-            return Task.CompletedTask;
+            return Task.FromResult(Result.Ok());
         }
     }
 }