feat: add AsNativeArray() read‑only accessor to `NetworkList<T>

com.unity.netcode.gameobjects/Runtime/NetworkVariable/Collections/NetworkList.cs

@@ -632,6 +632,26 @@ public T this[int index]
             }
         }
 
+        /// <summary>
+        /// Gets a **zero‑allocation**, read‑only
+        /// <see cref="Unity.Collections.NativeArray{T}.ReadOnly"/> view over the current
+        /// elements of this <see cref="NetworkList{T}"/>.
+        /// </summary>
+        /// <remarks>
+        /// The returned array stays valid **only until** the list is mutated (add, remove,
+        /// clear, resize) or the container is <see cref="Dispose()"/>d.  Continuing to use
+        /// it afterwards results in undefined behaviour; callers are responsible for
+        /// ensuring a safe lifetime.
+        /// </remarks>
+        /// <returns>
+        /// A read‑only <see cref="Unity.Collections.NativeArray{T}.ReadOnly"/> that shares
+        /// the same backing memory as this list.
+        /// </returns>
+        public NativeArray<T>.ReadOnly AsNativeArray()
+        {
+            return m_List.AsReadOnly();
+        }
+
         private void HandleAddListEvent(NetworkListEvent<T> listEvent)
         {
             m_DirtyEvents.Add(listEvent);