refactor: organize things a bit

src/StevesBot.Worker/Program.cs

@@ -1,7 +1,3 @@
-using System.Net.Http.Headers;
-
-using Microsoft.Extensions.Options;
-
 var builder = Host.CreateApplicationBuilder(args);
 
 builder.Services.Configure<HostOptions>(static options => options.ShutdownTimeout = TimeSpan.FromSeconds(30));
@@ -18,20 +14,11 @@ builder.Services.AddSingleton(static sp =>
 builder.Services.AddSingleton<IWebSocketFactory, WebSocketFactory>();
 builder.Services.AddSingleton(TimeProvider.System);
 
-builder.Services
-  .AddHttpClient<IDiscordRestClient, DiscordRestClient>(static (sp, c) =>
-  {
-    var discordOptions = sp.GetRequiredService<DiscordClientOptions>();
-    c.BaseAddress = new Uri(discordOptions.ApiUrl);
-    c.DefaultRequestHeaders.Authorization = new("Bot", discordOptions.AppToken);
-    c.DefaultRequestHeaders.Add("User-Agent", $"DiscordBot (https://github.com/StevanFreeborn/steves-bot, 0.0.0)");
-  })
-  .AddStandardResilienceHandler();
+builder.Services.AddDiscordRestClient();
 
-// TODO: Create an extension method that allows adding
-// the discord gateway client and allows me to configure
-// event handlers
-builder.Services.AddSingleton<IDiscordGatewayClient, DiscordGatewayClient>();
+builder.Services.AddDiscordGatewayClient(static (client) =>
+  client.On(DiscordEventTypes.MessageCreate, WelcomeMessageHandler.HandleAsync)
+);
 
 builder.Services.AddHostedService<Worker>();