[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

modules/ContentStore/Option/AllowNsfw.cs

@@ -0,0 +1,15 @@
+using Kruzya.TelegramBot.Core.Options;
+
+namespace West.TelegramBot.ContentStore.Option;
+
+public class AllowNsfw : AbstractOption<AllowNsfw, bool>
+{
+    public override string OptionId => "allowNSFW";
+    public override string OptionName => "NSFW";
+    public override OptionType OptionType => OptionType.OnOff;
+    public override bool DefaultValue => false;
+
+    public AllowNsfw(IOptionProvider optionProvider) : base(optionProvider)
+    {
+    }
+}