0.4.0: Claim, Models/ DTOs, compile

LeaderboardSession.ClaimAsync sends onClaim. Generated DTOs live under Models/ with nullable wire fields. Remove incomplete duplicate type files.

Storage/GetStorageResponse.cs

@@ -1,6 +1,5 @@
 // Code generated by apigen. DO NOT EDIT.
 using Newtonsoft.Json;
-using Newtonsoft.Json.Linq;
 using System.Collections.Generic;
 
 namespace RudderSdk.Core.Models.Storage;
@@ -8,9 +7,9 @@ namespace RudderSdk.Core.Models.Storage;
 public class GetStorageResponse
 {
     [JsonProperty("items")]
-    public List<StorageItem> Items { get; set; }
+    public List<StorageItem>? Items { get; set; }
 
     [JsonProperty("nextCursor")]
-    public string NextCursor { get; set; }
+    public string? NextCursor { get; set; }
 
 }