Remove InvocationLifetime class

Author: fredrikhr

src/System.CommandLine.Hosting/HostingAction.cs

@@ -50,6 +50,12 @@ public override async Task<int> InvokeAsync(ParseResult parseResult, Cancellatio
                               ?? new HostBuilder();
             hostBuilder.Properties[typeof(ParseResult)] = parseResult;
 
+            // As long as done before first await,
+            // we can set the process termination timeout to null
+            // and let the .NET Host ConsoleLifetime deal with termination
+            parseResult.Configuration.ProcessTerminationTimeout = null;
+            hostBuilder.UseConsoleLifetime();
+
             if (parseResult.Configuration.RootCommand is RootCommand root &&
                 root.Directives.SingleOrDefault(d => d.Name == HostingDirectiveName) is { } directive)
             {
@@ -72,7 +78,6 @@ 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