feat(kcp, pfa): Add kcp::Spinlock class

kernel/src/CppLib/Spinlock.cpp

@@ -0,0 +1,17 @@
+/*
+    * Spinlock.cpp
+    * C++ Spinlock
+    * Copyright (c) 2025 Daniel Hammer
+*/
+
+#include "Spinlock.hpp"
+
+namespace kcp {
+    void Spinlock::Aquire() {
+        while (atomic_flag.test_and_set(std::memory_order_acquire));
+    }
+
+    void Spinlock::Release() {
+        atomic_flag.clear(std::memory_order_release);
+    }
+};