Added SegmentedPool

UnmangedMMU/Allocators/DefaultUnmanagedAllocator.cs

@@ -0,0 +1,16 @@
+using System.Runtime.InteropServices;
+
+namespace UnmanagedMMU.Allocators
+{
+    /// <summary>
+    /// Wrapper class around <see cref="NativeMemory.Alloc(nuint)"/> and <see cref="NativeMemory.Free(void*)"/>.
+    /// </summary>
+    internal sealed unsafe class DefaultUnmanagedAllocator : IUnmanagedAllocator
+    {
+        /// <inheritdoc/>
+        public void* Alloc(nuint size) => NativeMemory.Alloc(size);
+
+        /// <inheritdoc/>
+        public void Free(void* ptr) => NativeMemory.Free(ptr);
+    }
+}