add: notify, minesweeper, migrations

dev: renames, refactors
change: remind optimized wait

src/NadekoBot/Db/Models/roles/TempRole.cs

@@ -0,0 +1,12 @@
+namespace NadekoBot.Db.Models;
+
+public class TempRole
+{
+    public int Id { get; set; }
+    public ulong GuildId { get; set; }
+    public bool Remove { get; set; }
+    public ulong RoleId { get; set; }
+    public ulong UserId { get; set; }
+    
+    public DateTime ExpiresAt { get; set; }
+}