Kernel: Add a Directory object and a getter for it from an Archive object.

src/core/hle/kernel/kernel.h

@@ -32,6 +32,7 @@ enum class HandleType : u32 {
     File            = 10,
     Semaphore       = 11,
     Archive         = 12,
+    Directory       = 13,
 };
     
 enum {