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/Server/Gumps/Legacy/GumpTextEntry.cs

@@ -1,54 +0,0 @@
-/*************************************************************************
- * ModernUO                                                              *
- * Copyright 2019-2024 - ModernUO Development Team                       *
- * Email: hi@modernuo.com                                                *
- * File: GumpTextEntry.cs                                                *
- *                                                                       *
- * This program is free software: you can redistribute it and/or modify  *
- * it under the terms of the GNU General Public License as published by  *
- * the Free Software Foundation, either version 3 of the License, or     *
- * (at your option) any later version.                                   *
- *                                                                       *
- * You should have received a copy of the GNU General Public License     *
- * along with this program.  If not, see <http://www.gnu.org/licenses/>. *
- *************************************************************************/
-
-using System.Buffers;
-using Server.Collections;
-
-namespace Server.Gumps;
-
-public class GumpTextEntry : GumpEntry
-{
-    public GumpTextEntry(int x, int y, int width, int height, int hue, int entryID, string initialText)
-    {
-        X = x;
-        Y = y;
-        Width = width;
-        Height = height;
-        Hue = hue;
-        EntryID = entryID;
-        InitialText = initialText;
-    }
-
-    public int X { get; set; }
-
-    public int Y { get; set; }
-
-    public int Width { get; set; }
-
-    public int Height { get; set; }
-
-    public int Hue { get; set; }
-
-    public int EntryID { get; set; }
-
-    public string InitialText { get; set; }
-
-    public override void AppendTo(ref SpanWriter writer, OrderedSet<string> strings, ref int entries, ref int switches)
-    {
-        var textIndex = strings.Add(InitialText ?? "");
-        writer.WriteAscii($"{{ textentry {X} {Y} {Width} {Height} {Hue} {EntryID} {textIndex} }}");
-        entries++;
-    }
-}