Implement JxlMemoryManager

For now JxlMemoryManager will be a wrapper around MemoryPool<T>.

src/ImageSharp/Formats/Jxl/Ac/JxlAcStrategyImage.cs

@@ -2,6 +2,7 @@
 // Licensed under the Six Labors Split License.
 
 using System.Diagnostics;
+using SixLabors.ImageSharp.Formats.Jxl.Memory;
 
 namespace SixLabors.ImageSharp.Formats.Jxl.Ac;
 

src/ImageSharp/Formats/Jxl/Memory/IJxlMemoryManager.cs

@@ -0,0 +1,12 @@
+// Copyright (c) Six Labors.
+// Licensed under the Six Labors Split License.
+
+using System.Buffers;
+
+namespace SixLabors.ImageSharp.Formats.Jxl.Memory;
+
+internal interface IJxlMemoryManager
+{
+    IMemoryOwner<T> Allocate<T>(int size);
+    IMemoryOwner<byte> Allocate(int size);
+}

src/ImageSharp/Formats/Jxl/Memory/JxlMemoryManager.cs

@@ -0,0 +1,18 @@
+// Copyright (c) Six Labors.
+// Licensed under the Six Labors Split License.
+
+using System.Buffers;
+
+namespace SixLabors.ImageSharp.Formats.Jxl.Memory;
+
+/// <summary>
+/// Allows allocation and deallocation of managed memory.
+/// </summary>
+internal sealed class JxlMemoryManager : IJxlMemoryManager
+{
+    public static readonly JxlMemoryManager Instance = new();
+
+    public IMemoryOwner<T> Allocate<T>(int size) => MemoryPool<T>.Shared.Rent(size);
+
+    public IMemoryOwner<byte> Allocate(int size) => this.Allocate<byte>(size);
+}