Add AddNLogWeb with NLog LogFactory and NLogAspNetCoreOptions for better isolation

[snakefoot]

Allows one to do this:

        var logFactory = new NLog.LogFactory.Setup()
           .SetupExtensions(e => e.AutoLoadAssemblies(false))
           .RegisterNLogWeb()
           .LoadConfigurationFromFile("nlog.config", optional: false)
           .LoadConfiguration(builder => builder.LogFactory.AutoShutdown = false).LogFactory;

            builder.UseStartup<Startup>()
                    .ConfigureLogging((ctx, logging) =>
                    {
                        logging.ClearProviders();
                        logging.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Debug);
                        logging.AddNLogWeb(logFactory, new NLogAspNetCoreOptions() { ShutdownOnDispose = true });
                    });

So the MEL receives an isolated LogFactory, that is fully initialised (Instead of using the global NLog.LogManager).

[sonarqubecloud]

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