Updated the SegmentedPool to allow for zeroing of allocations and for returning a pointer to allocated memory to allow for use in unsafe structs (#2)

UnmangedMMU/Handles/PersistentMemoryHandle.cs

@@ -0,0 +1,21 @@
+using UnmanagedMMU.Allocators;
+
+namespace UnmanagedMMU.Handles
+{
+    internal sealed unsafe class PersistentMemoryHandle<T> : MemoryHandleBase<T> where T : unmanaged
+    {
+
+        public PersistentMemoryHandle(void* ptr, nuint byteLength, IUnmanagedMemoryOwner owner) : base(ptr, byteLength, owner)
+        {
+        }
+
+        protected override void OnDispose()
+        {
+            if (Pointer != null)
+            {
+                GetOwner().Free(this);
+                // No need to set _ptr = null here; MemoryHandleBase._disposed flag prevents double-free
+            }
+        }
+    }
+}