[Ryujinx.Graphics.OpenGL] Address dotnet-format issues (#5372)

* dotnet format style --severity info

Some changes were manually reverted.

* dotnet format analyzers --serverity info

Some changes have been minimally adapted.

* Restore a few unused methods and variables

* Silence dotnet format IDE0060 warnings

* Address or silence dotnet format IDE1006 warnings

* Fix IDE0090 after rebase

* Address most dotnet format whitespace warnings

* Apply dotnet format whitespace formatting

A few of them have been manually reverted and the corresponding warning was silenced

* Format if-blocks correctly

* Another rebase, another dotnet format run

* Run dotnet format after rebase and remove unused usings

- analyzers
- style
- whitespace

* Add comments to disabled warnings

* Simplify properties and array initialization, Use const when possible, Remove trailing commas

* Start working on disabled warnings

* Address a few disabled IDE0060 warnings

* Silence IDE0060 in .editorconfig

* Revert "Simplify properties and array initialization, Use const when possible, Remove trailing commas"

This reverts commit 9462e4136c0a2100dc28b20cf9542e06790aa67e.

* dotnet format whitespace after rebase

* First dotnet format pass

* Address review feedback

src/Ryujinx.Graphics.OpenGL/PersistentBuffers.cs

@@ -11,10 +11,10 @@ namespace Ryujinx.Graphics.OpenGL
 {
     class PersistentBuffers : IDisposable
     {
-        private PersistentBuffer _main = new PersistentBuffer();
-        private PersistentBuffer _background = new PersistentBuffer();
+        private readonly PersistentBuffer _main = new();
+        private readonly PersistentBuffer _background = new();
 
-        private Dictionary<BufferHandle, IntPtr> _maps = new Dictionary<BufferHandle, IntPtr>();
+        private readonly Dictionary<BufferHandle, IntPtr> _maps = new();
 
         public PersistentBuffer Default => BackgroundContextWorker.InBackground ? _background : _main;
 
@@ -91,7 +91,7 @@ namespace Ryujinx.Graphics.OpenGL
             return _dataMap;
         }
 
-        private void Sync()
+        private static void Sync()
         {
             GL.MemoryBarrier(MemoryBarrierFlags.ClientMappedBufferBarrierBit);
 
@@ -133,7 +133,7 @@ namespace Ryujinx.Graphics.OpenGL
 
             Sync();
 
-            return new ReadOnlySpan<byte>(_bufferMap.ToPointer(), size).Slice(offset);
+            return new ReadOnlySpan<byte>(_bufferMap.ToPointer(), size)[offset..];
         }
 
         public unsafe ReadOnlySpan<byte> GetBufferData(BufferHandle buffer, int offset, int size)