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

FictionArchive.Service.NovelService/Services/EventHandlers/ChapterPullRequestedEventHandler.cs

@@ -0,0 +1,19 @@
+using FictionArchive.Service.NovelService.Models.IntegrationEvents;
+using FictionArchive.Service.Shared.Services.EventBus;
+
+namespace FictionArchive.Service.NovelService.Services.EventHandlers;
+
+public class ChapterPullRequestedEventHandler : IIntegrationEventHandler<ChapterPullRequestedEvent>
+{
+    private readonly NovelUpdateService _novelUpdateService;
+
+    public ChapterPullRequestedEventHandler(NovelUpdateService novelUpdateService)
+    {
+        _novelUpdateService = novelUpdateService;
+    }
+
+    public async Task Handle(ChapterPullRequestedEvent @event)
+    {
+        await _novelUpdateService.PullChapterContents(@event.NovelId, @event.ChapterNumber);
+    }
+}