[core] Massive setting system update

- Get rid of attribute crap. Now only interface is required
- Rename canUse to isAdmin in `Bot.IsUserAdminAsync` to match the actual meaning of variable
- Made `AnswerQuery` reusable by moving it from ContentStore to Core's CommonHandler
- Chat Settings edit frontend (inline keyboard)
- Rename NsfwOption to AllowNsfw and move it to ContentStore module
- Remove option backend testing commands
- Add KarmaMode option as an example of Select option type

Core/Options/SelectChoice.cs

@@ -0,0 +1,29 @@
+using System.Collections.Generic;
+using Telegram.Bot.Types.ReplyMarkups;
+
+namespace Kruzya.TelegramBot.Core.Options;
+
+public class SelectChoice
+{
+    public string Id { get; }
+    public string FullName { get; }
+    public string ShortName { get; }
+
+    public SelectChoice(string id, string fullName, string shortName)
+    {
+        Id = id;
+        FullName = fullName;
+        ShortName = shortName;
+    }
+
+    public IEnumerable<InlineKeyboardButton> ToButton(long userId, string optionId, bool isActive = false)
+    {
+        return new[]
+        {
+            new InlineKeyboardButton((isActive ? "🟢 " : "🔴 ") + FullName)
+            {
+                CallbackData = $"option|{userId}|select|{optionId}|{Id}"
+            }
+        };
+    }
+}