Texture loading: reduce memory allocations (#6623)

* rebase

* add methods Ryyjinx.Common EmbeddedResources and SteamUtils

* GAL changes - change SetData() methods and ThreadedTexture commands to use IMemoryOwner<byte> instead of SpanOrArray<byte>

* Ryujinx.Graphics.Texture: change texture conversion methods to return IMemoryOwner<byte> and allocate from ByteMemoryPool

* Ryujinx.Graphics.OpenGL: update ITexture and Texture-like types with SetData() methods to take IMemoryOwner<byte> instead of SpanOrArray<byte>

* Ryujinx.Graphics.Vulkan: update ITexture and Texture-like types with SetData() methods to take IMemoryOwner<byte> instead of SpanOrArray<byte>

* Ryujinx.Graphics.Gpu: update ITexture and Texture-like types with SetData() methods to take IMemoryOwner<byte> instead of SpanOrArray<byte>

* Remove now-unused SpanOrArray<T>

* post-rebase cleanup

* PixelConverter: remove unsafe modifier on safe methods, and remove one unnecessary cast

* use ByteMemoryPool.Rent() in GetWritableRegion() impls

* fix formatting, rename `ReadRentedMemory()` to `ReadFileToRentedMemory()``

* Texture.ConvertToHostCompatibleFormat(): dispose of `result` in Astc decode branch

src/Ryujinx.Graphics.Device/DeviceMemoryManager.cs

@@ -1,5 +1,7 @@
+using Ryujinx.Common.Memory;
 using Ryujinx.Memory;
 using System;
+using System.Buffers;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
@@ -143,11 +145,11 @@ namespace Ryujinx.Graphics.Device
             }
             else
             {
-                Memory<byte> memory = new byte[size];
+                IMemoryOwner<byte> memoryOwner = ByteMemoryPool.Rent(size);
 
-                GetSpan(va, size).CopyTo(memory.Span);
+                GetSpan(va, size).CopyTo(memoryOwner.Memory.Span);
 
-                return new WritableRegion(this, va, memory, tracked: true);
+                return new WritableRegion(this, va, memoryOwner, tracked: true);
             }
         }