feat(Auth.Client): Erstellt, um Client (Consumer) Ereignisse von SignalR zu behandeln.

- Erstellt ClientParams um AuthClient zu konfigurieren.
 - Erstellt ClientEvents, um Ereignisse im Client zu konfigurieren.

DigitalData.Auth.Client/AuthClient.cs

@@ -0,0 +1,32 @@
+using DigitalData.Auth.Abstractions;
+using Microsoft.AspNetCore.SignalR.Client;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+
+namespace DigitalData.Auth.Client;
+
+public class AuthClient : IAuthClient
+{
+    private readonly HubConnection _connection;
+
+    private readonly ILogger? _logger;
+
+    private readonly ClientParams _params;
+
+    public AuthClient(IOptions<ClientParams> paramsOptions, HubConnectionBuilder connectionBuilder, ILogger<AuthClient>? logger = null)
+    {
+        _connection = connectionBuilder
+            .WithUrl(paramsOptions.Value.Url)
+            .Build();
+
+        _connection.On<string, string>(nameof(ReceiveMessage), ReceiveMessage);
+
+        _logger = logger;
+
+        _params = paramsOptions.Value;
+    }
+
+    public async Task StartAsync() => await _connection.StartAsync();
+
+    public Task ReceiveMessage(string user, string message) => _params.Events.OnMessageReceived(user, message, _logger);
+}