feat(memory): refactor allocation and add new queue

Refactored memory management by removing safety checks and introducing `MemoryHandle` for centralized tracking. Simplified allocation logic across allocators and enhanced `Dispose` methods for better resource cleanup.

Added `UnsafeChunkedQueue<T>`, a lock-free, dynamically resizing queue with chunk-based memory management, supporting parallel producers and consumers.

Updated unit tests to validate new queue functionality and ensure compatibility with refactored memory logic. Incremented assembly version to 1.6.12.

BREAKING CHANGE: Removed `#if MHP_ENABLE_SAFETY_CHECKS` blocks, altering memory validation behavior.

Misaki.HighPerformance.LowLevel/Buffer/DynamicArena.cs

@@ -183,7 +183,12 @@ public unsafe struct DynamicArena : IMemoryAllocator<DynamicArena, DynamicArena.
             return;
         }
 
-        var current = _root;
+        var ptr = _root;
+
+        _root = null;
+        _current = null;
+
+        var current = ptr;
         while (current != null)
         {
             var next = current->next;
@@ -191,8 +196,5 @@ public unsafe struct DynamicArena : IMemoryAllocator<DynamicArena, DynamicArena.
             MemoryUtility.Free(current);
             current = next;
         }
-
-        _root = null;
-        _current = null;
     }
 }