fix: Refactors getting static tiles to use enumerators (#1611)

### Summary
* Refactors getting static/multi tiles to not use allocations.
* `TileList` is now only used during bootstrapping and uses rented buffers to eliminate extra allocations.
* Replaces `StaticTile[] GetStaticTiles` with:
    ```cs
        Map.StaticTileEnumerable GetStaticTiles(int x, int y);
        Map.StaticTileEnumerable GetStaticAndMultiTiles(int x, int y);
        Map.StaticTileEnumerable GetMultiTiles(int x, int y);
    ```
* Removes `Synchronized` and `lock` from TileMatrix. It is no longer considered a multi-thread safe system.

Projects/Server/Maps/Map.StaticTileEnumerator.cs

@@ -0,0 +1,138 @@
+/*************************************************************************
+ * ModernUO                                                              *
+ * Copyright 2019-2023 - ModernUO Development Team                       *
+ * Email: hi@modernuo.com                                                *
+ * File: Map.StaticTileEnumerator.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.Runtime.CompilerServices;
+using Server.Items;
+
+namespace Server;
+
+public partial class Map
+{
+    public ref struct StaticTileEnumerable
+    {
+        public static StaticTileEnumerable Empty
+        {
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            get => new();
+        }
+
+        private readonly Map _map;
+        private readonly Point2D _location;
+        private readonly bool _includeStatics;
+        private readonly bool _includeMultis;
+
+        public StaticTileEnumerable(Map map, Point2D loc, bool includeStatics = true, bool includeMultis = true)
+        {
+            _map = map;
+            _location = loc;
+            _includeStatics = includeStatics;
+            _includeMultis = includeMultis;
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public StaticTileEnumerator GetEnumerator() => new(_map, _location, _includeStatics, _includeMultis);
+    }
+
+    public ref struct StaticTileEnumerator
+    {
+        private readonly Map _map;
+        private readonly Point2D _point;
+
+        private StaticTile[] _tiles;
+        private MultiSectorEnumerator<BaseMulti> _multis;
+        private BaseMulti _currentMulti;
+
+        private int _index;
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public StaticTileEnumerator(Map map, Point2D p, bool includeStatics, bool includeMultis)
+        {
+            _map = map;
+            _point = p;
+
+            if (_map == null)
+            {
+                return;
+            }
+
+            if (includeStatics)
+            {
+                var tiles = map.Tiles.GetStaticBlock(p.X >> SectorShift, p.Y >> SectorShift);
+                _tiles = tiles[p.X & 0x7][p.Y & 0x7];
+                _index = -1;
+            }
+
+            _multis = includeMultis
+                ? _map.GetMultisInSector(p).GetEnumerator()
+                : MultiSectorEnumerable<BaseMulti>.Empty.GetEnumerator();
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private bool SetMulti()
+        {
+            ref var multis = ref _multis;
+            ref readonly var p = ref _point;
+
+            if (multis.MoveNext())
+            {
+                var multi = multis.Current;
+                _currentMulti = multi;
+                var components = multi!.Components;
+                var location = multi!.Location;
+
+                int offsetX = p.X - location.X - components.Min.X;
+                int offsetY = p.Y - location.Y - components.Min.Y;
+
+                if (offsetX >= 0 && offsetY >= 0 && offsetX < components.Width && offsetY < components.Height)
+                {
+                    _tiles = multi.Components.Tiles[offsetX][offsetY];
+                    _index = -1;
+                    return SetTile();
+                }
+            }
+
+            return false;
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private bool SetTile() => _tiles != null && ++_index < _tiles.Length;
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public bool MoveNext() => _map != null && (SetTile() || SetMulti());
+
+        public StaticTile Current
+        {
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            get
+            {
+                if (_currentMulti == null)
+                {
+                    return _tiles[_index];
+                }
+
+                var location = _currentMulti.Location;
+                ref readonly var tile = ref _tiles[_index];
+                return new StaticTile
+                {
+                    m_ID = tile.m_ID,
+                    X = tile.m_X,
+                    Y = tile.m_Y,
+                    Z = tile.m_Z + location.Z,
+                    m_Hue = tile.m_Hue
+                };
+            }
+        }
+    }
+}