Use AsyncKeyReaderWriterLock instead of ReadWorker/WriterWorker

Author: kroymann

src/ImageSharp.Web/DependencyInjection/ServiceCollectionExtensions.cs

@@ -11,6 +11,7 @@
 using SixLabors.ImageSharp.Web.Middleware;
 using SixLabors.ImageSharp.Web.Processors;
 using SixLabors.ImageSharp.Web.Providers;
+using SixLabors.ImageSharp.Web.Synchronization;
 
 namespace SixLabors.ImageSharp.Web.DependencyInjection
 {
@@ -57,6 +58,8 @@ private static void AddDefaultServices(
 
             builder.Services.AddSingleton<FormatUtilities>();
 
+            builder.Services.AddSingleton<AsyncKeyReaderWriterLock<string>>();
+
             builder.SetRequestParser<QueryCollectionRequestParser>();
 
             builder.SetCache<PhysicalFileSystemCache>();