add: Added .notify and migrations, added levelup and protection events for notify, removed xpnotify completely

src/NadekoBot/Modules/Xp/BuyResult.cs

@@ -0,0 +1,11 @@
+namespace NadekoBot.Modules.Xp.Services;
+
+public enum BuyResult
+{
+    Success,
+    XpShopDisabled,
+    AlreadyOwned,
+    InsufficientFunds,
+    UnknownItem,
+    InsufficientPatronTier,
+}