Temporary solution for UserContext (callerId)

dotnet/AipsCore/Infrastructure/DI/UserContextRegistrationExtension.cs

@@ -0,0 +1,14 @@
+using AipsCore.Application.Abstract.UserContext;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace AipsCore.Infrastructure.DI;
+
+public static class UserContextRegistrationExtension
+{
+    public static IServiceCollection AddUserContext(this IServiceCollection services)
+    {
+        services.AddTransient<IUserContext, UserContext>();
+        
+        return services;
+    }
+}