Create eventsource early on so that it can be discovered by EventSource.GetSources api

Author: kichalla

src/Microsoft.AspNetCore.Hosting/Internal/HostingApplication.cs

@@ -71,8 +71,6 @@ public void DisposeContext(Context context, Exception exception)
                 {
                     _diagnosticSource.Write("Microsoft.AspNetCore.Hosting.EndRequest", new { httpContext = httpContext, timestamp = currentTimestamp });
                 }
-
-                HostingEventSource.Log.RequestStop(httpContext);
             }
             else
             {

src/Microsoft.AspNetCore.Hosting/Internal/WebHost.cs

@@ -70,6 +70,10 @@ public WebHost(
             _hostingServiceProvider = hostingServiceProvider;
             _applicationServiceCollection.AddSingleton<IApplicationLifetime, ApplicationLifetime>();
             _applicationServiceCollection.AddSingleton<HostedServiceExecutor>();
+
+            // This is here for the sole reason to load it as fast as possible in the application domain and be found
+            // by the EventSource.GetSources() api.
+            var eventSource = HostingEventSource.Log;
         }
 
         public IServiceProvider Services