[FA-4] Adds an event bus infrastructure, a RabbitMQ implementation and rewires existing mutations on NovelService to utilize it.

FictionArchive.Service.Shared/Services/EventBus/Implementations/RabbitMQExtensions.cs

@@ -0,0 +1,24 @@
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Options;
+using RabbitMQ.Client;
+
+namespace FictionArchive.Service.Shared.Services.EventBus.Implementations;
+
+public static class RabbitMQExtensions
+{
+    public static EventBusBuilder<RabbitMQEventBus> AddRabbitMQ(this IServiceCollection services, Action<RabbitMQOptions> configure)
+    {
+        services.Configure(configure);
+        services.AddSingleton<IConnectionFactory, ConnectionFactory>(provider =>
+        {
+            var options = provider.GetService<IOptions<RabbitMQOptions>>();
+            ConnectionFactory factory = new ConnectionFactory();
+            factory.Uri = new Uri(options.Value.ConnectionString);
+            return factory;
+        });
+        services.AddSingleton<RabbitMQConnectionProvider>();
+        services.AddHostedService<RabbitMQEventBus>();
+        return services.AddEventBus<RabbitMQEventBus>();
+    }
+}