Add empty service metadata object

Author: corstian

src/Whaally.Domain.Testing/ServiceTest.cs

@@ -21,7 +21,7 @@ public ServiceTest(
         Service = service;
 
         var id = Guid.NewGuid();
-        Context = new ServiceHandlerContext(Services)
+        Context = new ServiceHandlerContext(Services, new ServiceMetadata())
         {
             ParentContext = default
         };

src/Whaally.Domain/Service/ServiceMetadata.cs

@@ -5,8 +5,7 @@ namespace Whaally.Domain;
 
 public record ServiceMetadata : IServiceMetadata
 {
-    public IDictionary<string, object> Attributes { get; set; }
-        = new Dictionary<string, object>();
+    public IDictionary<string, object> Attributes { get; set; } = new Dictionary<string, object>();
     public ActivityContext? ParentContext { get; set; }
     public DateTimeOffset CreatedAt { get; set; }
     public Type? ServiceType { get; set; }