* Implicit handlers building extensions generator refactored

* Telegram.Bot package updated

Telegrator.Analyzers/RoslynExtensions/SymbolsExtensions.cs

@@ -0,0 +1,28 @@
+using Microsoft.CodeAnalysis;
+
+namespace Telegrator.Analyzers.RoslynExtensions;
+
+public static class SymbolsExtensions
+{
+    public static bool IsAssignableFrom(this ITypeSymbol symbol, string className)
+    {
+        if (symbol.BaseType == null)
+            return false;
+
+        if (symbol.BaseType.Name == className)
+            return true;
+
+        return symbol.BaseType.IsAssignableFrom(className);
+    }
+
+    public static ITypeSymbol? Cast(this ITypeSymbol symbol, string className)
+    {
+        if (symbol.BaseType == null)
+            return null;
+
+        if (symbol.BaseType.Name == className)
+            return symbol.BaseType;
+
+        return symbol.BaseType.Cast(className);
+    }
+}