[REFACTOR] Convert message loop classes to sealed classes

TelegramBotBase/MessageLoops/FormBaseMessageLoop.cs

@@ -12,7 +12,7 @@ namespace TelegramBotBase.MessageLoops;
 /// <summary>
 ///     Thats the default message loop which reacts to Message, EditMessage and CallbackQuery.
 /// </summary>
-public class FormBaseMessageLoop : IMessageLoopFactory
+public sealed class FormBaseMessageLoop : IMessageLoopFactory
 {
     private static readonly object EvUnhandledCall = new();
 

TelegramBotBase/MessageLoops/FullMessageLoop.cs

@@ -12,7 +12,7 @@ namespace TelegramBotBase.MessageLoops;
 /// <summary>
 ///     This message loop reacts to all update types.
 /// </summary>
-public class FullMessageLoop : IMessageLoopFactory
+public sealed class FullMessageLoop : IMessageLoopFactory
 {
     private static readonly object EvUnhandledCall = new();
 

TelegramBotBase/MessageLoops/MinimalMessageLoop.cs

@@ -11,7 +11,7 @@ namespace TelegramBotBase.MessageLoops;
 /// <summary>
 ///     This is a minimal message loop which will react to all update types and just calling the Load method.
 /// </summary>
-public class MinimalMessageLoop : IMessageLoopFactory
+public sealed class MinimalMessageLoop : IMessageLoopFactory
 {
     private static readonly object EvUnhandledCall = new();