feat: Moves gumps out of the core (#1916)

> [!Important]
> **Developer Note**
> This code change will **completely move gumps out of the core**


### Summary

- Adds `GetGumps()` convenience which exposes methods to Find/Close/Send multiple gumps. This helper is a performance improvement by eliminating the Dictionary<Player, List> lookup for gumps.

Projects/UOContent/Engines/Advanced Search/AdvancedSearchCommand.cs

@@ -1,3 +1,5 @@
+using Server.Gumps;
+
 namespace Server.Engines.AdvancedSearch;
 
 public static class AdvancedSearchCommand
@@ -14,7 +16,6 @@ public static class AdvancedSearchCommand
     {
         var from = e.Mobile;
 
-        from.CloseGump<AdvancedSearchGump>();
-        from.SendGump(new AdvancedSearchGump(from));
+        from.SendGump(new AdvancedSearchGump(from), true);
     }
 }