Backport Delivery API member auth from V14 (#14964)

* Backport Delivery API member auth from V14

* Add default implementations to avoid breakage

* Review changes

src/Umbraco.Core/Models/DeliveryApi/ProtectedAccess.cs

@@ -0,0 +1,16 @@
+namespace Umbraco.Cms.Core.Models.DeliveryApi;
+
+public sealed class ProtectedAccess
+{
+    public static ProtectedAccess None => new(null, null);
+
+    public ProtectedAccess(Guid? memberKey, string[]? memberRoles)
+    {
+        MemberKey = memberKey;
+        MemberRoles = memberRoles;
+    }
+
+    public Guid? MemberKey { get; }
+
+    public string[]? MemberRoles { get; }
+}