Update memory management and collection structures

Added `AllocationHandler` struct for memory allocation management.
Added `UnsafeArrayPool` class for pooling `UnsafeArray<T>` instances.
Added new `External` option to `Allocator` enum.
Added default constructors for `UnsafeList`, `UnsafeQueue`, and `UnsafeStack` using `Persistent` allocator.
Changed namespace in `AllocationManager` to `Misaki.HighPerformance.Unsafe.Buffer`.
Changed `MemoryLeakException` to use `MemoryLeakExceptionInfo` for better debugging.
Changed constructor behavior in `UnsafeArray` to clarify memory management responsibilities.
Changed `MemoryUtilities` to include null checks in `Free` and `AlignedFree` methods.
Removed unused using directive in `CollectionBenchmark.cs`.
Removed initialization of `AllocationManager` in `Program.cs`.

Misaki.HighPerformance.Unsafe/Helpers/HashMapHelper.cs

@@ -1,5 +1,5 @@
+using Misaki.HighPerformance.Unsafe.Buffer;
 using Misaki.HighPerformance.Unsafe.Collections;
-using Misaki.HighPerformance.Unsafe.Services;
 using System.Numerics;
 using System.Runtime.CompilerServices;
 

Misaki.HighPerformance.Unsafe/Helpers/MemoryUtilities.cs

@@ -69,6 +69,11 @@ public static unsafe class MemoryUtilities
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static void Free(void* ptr)
     {
+        if (ptr == null)
+        {
+            return;
+        }
+
         NativeMemory.Free(ptr);
     }
 
@@ -80,6 +85,11 @@ public static unsafe class MemoryUtilities
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static void AlignedFree(void* ptr)
     {
+        if (ptr == null)
+        {
+            return;
+        }
+
         NativeMemory.AlignedFree(ptr);
     }