feat(buffer): add TLSF allocator and seqlock primitives

Added a TLSF (Two-Level Segregated Fit) memory allocator with O(1) allocation, free, and reallocation in `TLSF.cs`, plus comprehensive unit tests. Introduced a cache-line-padded `SeqLock` synchronization primitive. Refactored vector extension code for conciseness and fixed its usage to `extension(ref ...)`. Updated namespaces, removed unused code, and improved assertion and diagnostics. Updated NuGet dependencies and project files.

Misaki.HighPerformance.Test/Benchmark/ReadWriteLockBenchmark.cs

@@ -0,0 +1,9 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Misaki.HighPerformance.Test.Benchmark;
+
+public class ReadWriteLockBenchmark
+{
+}