sdk: LoginWithCustomAsync + regenerated auth models

Exceptions/RudderNetworkException.cs

@@ -0,0 +1,17 @@
+using System;
+
+namespace RudderSdk.Core;
+
+/// <summary>
+/// The request never got a response: DNS/connectivity failure or client-side
+/// timeout. <see cref="RudderApiException.StatusCode"/> is 0. Retrying is safe
+/// for idempotent operations.
+/// </summary>
+public sealed class RudderNetworkException : RudderApiException
+{
+    /// <summary>Creates the exception.</summary>
+    public RudderNetworkException(string message, Exception? innerException = null)
+        : base(0, string.Empty, message, null, innerException)
+    {
+    }
+}