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

Moonlight.Api/StartupHandler.cs

@@ -0,0 +1,42 @@
+using Microsoft.AspNetCore.Builder;
+using Microsoft.Extensions.Hosting;
+
+namespace Moonlight.Api;
+
+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 = WebApplication.CreateBuilder(args);
+
+        // Setting up context
+        foreach (var plugin in plugins)
+            plugin.Initialize(plugins);
+
+        // Stage 1: Pre Build
+        foreach (var startup in plugins)
+            startup.PreBuild(builder);
+
+        var app = builder.Build();
+
+        // Stage 2: Post Build
+        foreach (var startup in plugins)
+            startup.PostBuild(app);
+
+        // Stage 3: Post Middleware
+        foreach (var startup in plugins)
+            startup.PostMiddleware(app);
+
+        // Frontend debugging
+        if (app.Environment.IsDevelopment())
+            app.UseWebAssemblyDebugging();
+
+        // Frontend hosting
+        app.UseBlazorFrameworkFiles();
+        app.UseStaticFiles();
+
+        await app.RunAsync();
+    }
+}