Improved handling of moonlight plugins during startup, minimized host project code and moved startup handling to core

Moonlight.Frontend/StartupHandler.cs

@@ -0,0 +1,23 @@
+using Microsoft.AspNetCore.Components.WebAssembly.Hosting;
+
+namespace Moonlight.Frontend;
+
+public static class StartupHandler
+{
+    public static async Task RunAsync(string[] args, MoonlightPlugin[] plugins)
+    {
+        Console.WriteLine($"Starting with: {string.Join(", ", plugins.Select(x => x.GetType().FullName))}");
+        
+        var builder = WebAssemblyHostBuilder.CreateDefault(args);
+
+        foreach (var plugin in plugins)
+            plugin.PreBuild(builder);
+
+        var app = builder.Build();
+
+        foreach(var plugin in plugins)
+            plugin.PostBuild(app);
+
+        await app.RunAsync();
+    }
+}