sdk: LoginWithCustomAsync + regenerated auth models

Exceptions/RudderApiException.cs

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+using System;
+
+namespace RudderSdk.Core;
+
+/// <summary>
+/// Base exception for every API failure. Carries the HTTP status code
+/// (0 for network failures, see <see cref="RudderNetworkException"/>), the
+/// machine-readable API error code (see <see cref="RudderErrorCodes"/>) and the
+/// server-issued request id when available.
+/// </summary>
+public class RudderApiException : Exception
+{
+    /// <summary>HTTP status code, or 0 when the request never reached the server.</summary>
+    public int StatusCode { get; }
+
+    /// <summary>Machine-readable API error code, or an empty string.</summary>
+    public string Code { get; }
+
+    /// <summary>Server-issued request id for support tickets, or null.</summary>
+    public string? RequestId { get; }
+
+    /// <summary>Creates the exception.</summary>
+    public RudderApiException(int statusCode, string? code, string message, string? requestId = null)
+        : base(message)
+    {
+        StatusCode = statusCode;
+        Code = code ?? string.Empty;
+        RequestId = requestId;
+    }
+
+    /// <summary>Creates the exception wrapping an inner transport error.</summary>
+    public RudderApiException(int statusCode, string? code, string message, string? requestId, Exception? innerException)
+        : base(message, innerException)
+    {
+        StatusCode = statusCode;
+        Code = code ?? string.Empty;
+        RequestId = requestId;
+    }
+}

Exceptions/RudderAuthException.cs

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+namespace RudderSdk.Core;
+
+/// <summary>
+/// The server rejected the request as unauthenticated (HTTP 401). The SDK
+/// attempts a token refresh before surfacing this; seeing it means the session
+/// is over and the player must sign in again.
+/// </summary>
+public sealed class RudderAuthException : RudderApiException
+{
+    /// <summary>Creates the exception.</summary>
+    public RudderAuthException(int statusCode, string? code, string message, string? requestId = null)
+        : base(statusCode, code, message, requestId)
+    {
+    }
+}

Exceptions/RudderNetworkException.cs

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+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)
+    {
+    }
+}

Exceptions/RudderNotFoundException.cs

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+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)
+    {
+    }
+}

Exceptions/RudderRateLimitException.cs

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+namespace RudderSdk.Core;
+
+/// <summary>The client hit a server rate limit (HTTP 429); back off and retry later.</summary>
+public sealed class RudderRateLimitException : RudderApiException
+{
+    /// <summary>Creates the exception.</summary>
+    public RudderRateLimitException(int statusCode, string? code, string message, string? requestId = null)
+        : base(statusCode, code, message, requestId)
+    {
+    }
+}