fix(kernel/vfs): 🎉 a complete rewrite of the vfs

This is the fourth time re-writing the VFS, hope this will be the last. Tried to make it as modular as possible so this won't be necessary in the future. 🙏

This change required the entire kernel code to be modified.

Kernel/kernel_vfs.cpp

@@ -17,7 +17,7 @@
 
 #include "kernel.h"
 
-#include <filesystem/ustar.hpp>
+#include <fs/ustar.hpp>
 #include <memory.hpp>
 
 vfs::Virtual *fs = nullptr;