Adds outdated command. Closes #657 (#659)

Author: garrytrinder

dev-proxy/OutdatedCommandHandler.cs

@@ -0,0 +1,13 @@
+using Microsoft.Extensions.Logging;
+
+namespace Microsoft.DevProxy;
+
+public static class OutdatedCommandHandler
+{
+    public static async Task CheckVersion(ILogger logger)
+    {
+        var releaseInfo = await UpdateNotification.CheckForNewVersion(ProxyCommandHandler.Configuration.NewVersionNotification);
+        logger.LogInformation(releaseInfo?.Version);
+    }
+}
+

dev-proxy/ProxyHost.cs

@@ -2,6 +2,7 @@
 // Licensed under the MIT License.
 
 using Microsoft.DevProxy.Abstractions;
+using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.Logging;
 using System.CommandLine;
 using System.Net;
@@ -300,6 +301,11 @@ public RootCommand GetRootCommand(IProxyLogger logger)
 
         command.Add(presetCommand);
 
+        var outdatedCommand = new Command("outdated", "Check for new version");
+        
+        outdatedCommand.SetHandler(async () => await OutdatedCommandHandler.CheckVersion(logger));
+        command.Add(outdatedCommand);
+
         return command;
     }