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/include/types.h

@@ -458,6 +458,10 @@ typedef uint48_t uint_fast48_t;
 #define hot __attribute__((hot))
 #define cold __attribute__((cold))
 
+#define OPTIONAL
+#define IN
+#define OUT
+
 #define NoSecurityAnalysis __no_stack_protector __no_sanitize_address __no_sanitize_undefined __no_sanitize_thread
 #define nsa NoSecurityAnalysis