Add ConnectRabbitMq method to EmailSender class

Introduce a new static method `ConnectRabbitMq` in the `EmailSender` class to configure and establish RabbitMQ connections using a URL, username, and password. The method extracts connection details (host, port, virtual host) from the URL and supports optional behavior for reconnection scenarios via the `onReconnect` parameter. Added `using System;` to support the `Uri` class.

src/presentation/DigitalData.MessagingService.Client.DependencyInjection/EmailSender.cs

@@ -2,6 +2,7 @@
 using DigitalData.MessagingService.Publisher.Abstraction;
 using DigitalData.MessagingService.RabbitMQ;
 using Microsoft.Extensions.DependencyInjection;
+using System;
 
 namespace DigitalData.MessagingService.Client.DependencyInjection;
 
@@ -71,6 +72,39 @@ public static class EmailSender
         _ = LazyProvider.Value; // Force initialization
     }
 
+    /// <summary>
+    /// Configures and establishes a connection to RabbitMQ using a URL, then initializes
+    /// the internal dependency injection container.
+    /// </summary>
+    /// <param name="url">
+    /// The RabbitMQ server URL (e.g. <c>amqp://hostname:5672/virtualhost</c>).
+    /// The host, port, and virtual host are extracted from this URL.
+    /// </param>
+    /// <param name="username">The username used to authenticate with RabbitMQ.</param>
+    /// <param name="password">The password used to authenticate with RabbitMQ.</param>
+    /// <param name="onReconnect">
+    /// Controls the behavior when this method is called while already connected.
+    /// Defaults to <see cref="OnReconnect.ThrowException"/>.
+    /// </param>
+    /// <exception cref="InvalidOperationException">
+    /// Thrown when the service is already connected and
+    /// <paramref name="onReconnect"/> is <see cref="OnReconnect.ThrowException"/>.
+    /// </exception>
+    public static void ConnectRabbitMq(string url, string username, string password, OnReconnect onReconnect = OnReconnect.ThrowException)
+    {
+        var uri = new Uri(url);
+
+        ConnectRabbitMq(cfg =>
+        {
+            cfg.HostName = uri.Host;
+            cfg.Port = uri.IsDefaultPort ? 5672 : uri.Port;
+            cfg.UserName = username;
+            cfg.Password = password;
+            if (!string.IsNullOrEmpty(uri.AbsolutePath) && uri.AbsolutePath != "/")
+                cfg.VirtualHost = Uri.UnescapeDataString(uri.AbsolutePath.TrimStart('/'));
+        }, onReconnect);
+    }
+
     /// <summary>
     /// Enqueues the specified email event to the RabbitMQ messaging pipeline.
     /// </summary>