[FA-misc] Add IJobStatusUpdate event contract and publishing helper

Reviewed-on: #63

FictionArchive.Common/Enums/JobStatus.cs

@@ -0,0 +1,9 @@
+namespace FictionArchive.Common.Enums;
+
+public enum JobStatus
+{
+    Failed = -1,
+    Pending = 0,
+    InProgress = 1,
+    Completed = 2
+}

FictionArchive.Service.Shared/Contracts/Events/IJobStatusUpdate.cs

@@ -0,0 +1,23 @@
+using FictionArchive.Common.Enums;
+
+namespace FictionArchive.Service.Shared.Contracts.Events;
+
+public interface IJobStatusUpdate
+{
+    Guid JobId { get; }
+    Guid? ParentJobId { get; }
+    string JobType { get; }
+    string DisplayName { get; }
+    JobStatus Status { get; }
+    string? ErrorMessage { get; }
+    Dictionary<string, string>? Metadata { get; }
+}
+
+public record JobStatusUpdate(
+    Guid JobId,
+    Guid? ParentJobId,
+    string JobType,
+    string DisplayName,
+    JobStatus Status,
+    string? ErrorMessage,
+    Dictionary<string, string>? Metadata) : IJobStatusUpdate;

FictionArchive.Service.Shared/Extensions/JobStatusPublisher.cs

@@ -0,0 +1,20 @@
+using FictionArchive.Common.Enums;
+using FictionArchive.Service.Shared.Contracts.Events;
+using MassTransit;
+
+namespace FictionArchive.Service.Shared.Extensions;
+
+public static class JobStatusPublisher
+{
+    public static Task ReportJobStatus(
+        this IPublishEndpoint endpoint,
+        Guid jobId,
+        string jobType,
+        string displayName,
+        JobStatus status,
+        Guid? parentJobId = null,
+        string? errorMessage = null,
+        Dictionary<string, string>? metadata = null)
+        => endpoint.Publish<IJobStatusUpdate>(new JobStatusUpdate(
+            jobId, parentJobId, jobType, displayName, status, errorMessage, metadata));
+}