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/Items/Deeds/NameChangeDeed.cs

@@ -17,7 +17,6 @@ public partial class NameChangeDeed : Item
     {
         if (RootParent == from)
         {
-            from.CloseGump<NameChangeDeedGump>();
             from.SendGump(new NameChangeDeedGump(this));
         }
         else
@@ -31,6 +30,8 @@ public class NameChangeDeedGump : Gump
 {
     private readonly Item m_Sender;
 
+    public override bool Singleton => true;
+
     public NameChangeDeedGump(Item sender) : base(50, 50)
     {
         m_Sender = sender;