sdk: LoginWithCustomAsync + regenerated auth models

Auth/LoginViaCustomRequest.cs

@@ -0,0 +1,24 @@
+// Code generated by apigen. DO NOT EDIT.
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+
+namespace RudderSdk.Core.Models.Auth;
+
+public class LoginViaCustomRequest
+{
+    [JsonProperty("customData")]
+    public JToken? CustomData { get; set; }
+
+    [JsonProperty("key")]
+    public string? Key { get; set; }
+
+    [JsonProperty("language")]
+    public string? Language { get; set; }
+
+    [JsonProperty("nickname")]
+    public string? Nickname { get; set; }
+
+    [JsonProperty("region")]
+    public string? Region { get; set; }
+
+}

Auth/LoginViaCustomResponse.cs

@@ -0,0 +1,14 @@
+// Code generated by apigen. DO NOT EDIT.
+using Newtonsoft.Json;
+
+namespace RudderSdk.Core.Models.Auth;
+
+public class LoginViaCustomResponse
+{
+    [JsonProperty("accessToken")]
+    public string? AccessToken { get; set; }
+
+    [JsonProperty("refreshToken")]
+    public string? RefreshToken { get; set; }
+
+}