🧱 Add stream (NATS) message queue infra

DysonNetwork.Shared/Stream/AccountEvent.cs

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+using NodaTime;
+
+namespace DysonNetwork.Shared.Stream;
+
+public class AccountDeletedEvent
+{
+    public Guid AccountId { get; set; } = Guid.NewGuid();
+    public Instant DeletedAt { get; set; } = SystemClock.Instance.GetCurrentInstant();
+}

DysonNetwork.Shared/Stream/Connector.cs

@@ -0,0 +1,21 @@
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using NATS.Client.Core;
+
+namespace DysonNetwork.Shared.Stream;
+
+public static class Connector
+{
+    public static IServiceCollection AddStreamConnection(this IServiceCollection services, IConfiguration configuration)
+    {
+        var connectionString = configuration.GetConnectionString("Stream");
+        if (connectionString is null)
+            throw new ArgumentNullException(nameof(connectionString));
+        services.AddSingleton<INatsConnection>(_ => new NatsConnection(new NatsOpts()
+        {
+            Url = connectionString
+        }));
+        
+        return services;
+    }
+}