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/Exceptions/MemoryLeakException.cs

@@ -1,11 +1,27 @@
-using Misaki.HighPerformance.Unsafe.Services;
+#if DEBUG
 using System.Diagnostics;
 using System.Text;
+#endif
 
 namespace Misaki.HighPerformance.Unsafe;
 
-internal class MemoryLeakException(params AllocationInfo[] Infos) : Exception
+public readonly struct MemoryLeakExceptionInfo
 {
+    public nuint Size
+    {
+        get; init;
+    }
+#if DEBUG
+    public StackTrace StackTrace
+    {
+        get; init;
+    }
+#endif
+}
+
+public class MemoryLeakException(params MemoryLeakExceptionInfo[] Infos) : Exception
+{
+#if DEBUG
     private static string GetMessage(StackTrace? stackTrace)
     {
         if (stackTrace == null)
@@ -27,6 +43,7 @@ internal class MemoryLeakException(params AllocationInfo[] Infos) : Exception
 
         return stringBuilder.ToString();
     }
+#endif
 
     public override string Message
     {