Remove InvocationLifetime class

Author: fredrikhr

src/System.CommandLine.Hosting/HostingAction.cs

@@ -72,7 +72,6 @@ public override async Task<int> InvokeAsync(ParseResult parseResult, Cancellatio
 
             var bindingContext = GetBindingContext(parseResult);
             int registeredBefore = 0;
-            hostBuilder.UseInvocationLifetime();
             hostBuilder.ConfigureServices(services =>
             {
                 services.AddSingleton(parseResult);

src/System.CommandLine.Hosting/HostingExtensions.cs

@@ -31,16 +31,6 @@ public static CommandLineConfiguration UseHost(
             Action<IHostBuilder> configureHost = null
         ) => UseHost(config, null, configureHost);
 
-        public static IHostBuilder UseInvocationLifetime(this IHostBuilder host, Action<InvocationLifetimeOptions> configureOptions = null)
-        {
-            return host.ConfigureServices(services =>
-            {
-                services.AddSingleton<IHostLifetime, InvocationLifetime>();
-                if (configureOptions is Action<InvocationLifetimeOptions>)
-                    services.Configure(configureOptions);
-            });
-        }
-
         public static OptionsBuilder<TOptions> BindCommandLine<TOptions>(
             this OptionsBuilder<TOptions> optionsBuilder)
             where TOptions : class