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

FictionArchive.Service.Shared/Services/EventBus/IntegrationEvent.cs

@@ -0,0 +1,9 @@
+using NodaTime;
+
+namespace FictionArchive.Service.Shared.Services.EventBus;
+
+public abstract class IntegrationEvent
+{
+    public Guid EventId { get; set; }
+    public Instant CreatedAt { get; set; }
+}