sdk: LoginWithCustomAsync + regenerated auth models

Exceptions/RudderNotFoundException.cs

@@ -0,0 +1,11 @@
+namespace RudderSdk.Core;
+
+/// <summary>The requested resource does not exist (HTTP 404).</summary>
+public sealed class RudderNotFoundException : RudderApiException
+{
+    /// <summary>Creates the exception.</summary>
+    public RudderNotFoundException(int statusCode, string? code, string message, string? requestId = null)
+        : base(statusCode, code, message, requestId)
+    {
+    }
+}