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/Plants/PlantPourTarget.cs

@@ -1,3 +1,4 @@
+using Server.Gumps;
 using Server.Targeting;
 
 namespace Server.Engines.Plants
@@ -21,12 +22,7 @@ namespace Server.Engines.Plants
             if (!m_Plant.Deleted && m_Plant.PlantStatus < PlantStatus.DecorativePlant &&
                 from.InRange(m_Plant.GetWorldLocation(), 3) && m_Plant.IsUsableBy(from))
             {
-                if (from.HasGump<MainPlantGump>())
-                {
-                    from.CloseGump<MainPlantGump>();
-                }
-
-                from.SendGump(new MainPlantGump(m_Plant));
+                from.SendGump(new MainPlantGump(m_Plant), true);
             }
         }
     }

Projects/UOContent/Engines/Plants/PollinateTarget.cs

@@ -1,3 +1,4 @@
+using Server.Gumps;
 using Server.Targeting;
 
 namespace Server.Engines.Plants