[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/Handler/CommonHandler.cs

@@ -53,5 +53,10 @@ namespace Kruzya.TelegramBot.Core.Handler
         {
             return await Db.UserValues.FindOrCreateOption(Chat.Id, user.Id, "warnCount");
         }
+
+        protected async Task AnswerQuery(string id, string? message = null)
+        {
+            await Bot.AnswerCallbackQueryAsync(id, message);
+        }
     }
 }