Enhance noise generation and memory management

Added new noise generation methods in `ParallelNoiseBenchmark`, including `Frac`, `Lerp`, and `GradientNoiseDirect`, and updated the `GradientNoise` method to utilize them. Changed constants to use `_LENGTH` for consistency.

Changed `Arena` and `DynamicArena` classes to use `uint` instead of `ulong` for size fields, improving memory usage. Updated memory allocation to use `NativeMemory` for better performance and safety.

Updated `UnsafeArray<T>` and `UnsafeList<T>` classes to replace `Marshal` methods with `NativeMemory`, enhancing performance and safety. Modified `Dispose` methods to use `NativeMemory.AlignedFree`.

Added `MemoryUtilities` class with new methods for memory management, including `MemClear`, `MemSet`, `MemCpy`, `SizeOf`, and `AlignOf`, utilizing `NativeMemory`.

Fixed minor cleanup in the `ObjectPool` class's `Dispose` method.

Misaki.HighPerformance.Unsafe/Collections/UnsafeArray.cs

@@ -78,7 +78,7 @@ public unsafe struct UnsafeArray<T> : IUnsafeCollection<T>, IEnumerable<T> where
     public UnsafeArray(int size, AllocationType allocationType)
     {
         _size = size;
-        _buffer = (T*)Marshal.AllocHGlobal(size * sizeof(T)).ToPointer();
+        _buffer = (T*)NativeMemory.AlignedAlloc((nuint)(size * sizeof(T)), (nuint)AlignOf<T>());
 
         if (allocationType == AllocationType.Clear)
         {
@@ -93,7 +93,7 @@ public unsafe struct UnsafeArray<T> : IUnsafeCollection<T>, IEnumerable<T> where
             return;
         }
 
-        _buffer = (T*)Marshal.ReAllocHGlobal((IntPtr)_buffer, newSize * sizeof(T)).ToPointer();
+        _buffer = (T*)NativeMemory.AlignedRealloc(_buffer, (nuint)(newSize * sizeof(T)), (nuint)AlignOf<T>());
         _size = newSize;
     }
 
@@ -105,7 +105,7 @@ public unsafe struct UnsafeArray<T> : IUnsafeCollection<T>, IEnumerable<T> where
 
     public void Dispose()
     {
-        Marshal.FreeHGlobal((IntPtr)_buffer);
+        NativeMemory.AlignedFree(_buffer);
 
         _buffer = null;
         _size = 0;

Misaki.HighPerformance.Unsafe/Collections/UnsafeList.cs

@@ -124,7 +124,7 @@ public unsafe struct UnsafeList<T> : IUnsafeCollection<T>, IEnumerable<T> where
 
     public UnsafeList(int capacity, AllocationType allocationType)
     {
-        _buffer = (T*)Marshal.AllocHGlobal(capacity * sizeof(T));
+        _buffer = (T*)NativeMemory.AlignedAlloc((nuint)(capacity * sizeof(T)), (nuint)AlignOf<T>());
         _size = 0;
         _capacity = capacity;
 
@@ -270,7 +270,7 @@ public unsafe struct UnsafeList<T> : IUnsafeCollection<T>, IEnumerable<T> where
             return;
         }
 
-        _buffer = (T*)Marshal.ReAllocHGlobal((IntPtr)_buffer, newSize * sizeof(T)).ToPointer();
+        _buffer = (T*)NativeMemory.AlignedRealloc(_buffer, (nuint)(newSize * sizeof(T)), (nuint)AlignOf<T>());
         _size = newSize;
     }
 
@@ -282,7 +282,7 @@ public unsafe struct UnsafeList<T> : IUnsafeCollection<T>, IEnumerable<T> where
 
     public void Dispose()
     {
-        Marshal.FreeHGlobal((IntPtr)_buffer);
+        NativeMemory.AlignedFree(_buffer);
 
         _buffer = null;
         _size = 0;