Restructure solution layout by module

src/Policy/StellaOps.Policy.Gateway/Clients/PolicyEngineResponse.cs

@@ -0,0 +1,31 @@
+using System.Net;
+using Microsoft.AspNetCore.Mvc;
+
+namespace StellaOps.Policy.Gateway.Clients;
+
+internal sealed class PolicyEngineResponse<TSuccess>
+{
+    private PolicyEngineResponse(HttpStatusCode statusCode, TSuccess? value, ProblemDetails? problem, string? location)
+    {
+        StatusCode = statusCode;
+        Value = value;
+        Problem = problem;
+        Location = location;
+    }
+
+    public HttpStatusCode StatusCode { get; }
+
+    public TSuccess? Value { get; }
+
+    public ProblemDetails? Problem { get; }
+
+    public string? Location { get; }
+
+    public bool IsSuccess => Problem is null && StatusCode is >= HttpStatusCode.OK and < HttpStatusCode.MultipleChoices;
+
+    public static PolicyEngineResponse<TSuccess> Success(HttpStatusCode statusCode, TSuccess? value, string? location)
+        => new(statusCode, value, problem: null, location);
+
+    public static PolicyEngineResponse<TSuccess> Failure(HttpStatusCode statusCode, ProblemDetails? problem)
+        => new(statusCode, value: default, problem, location: null);
+}