Implement read_dir_entry () VFS op, CE add ls command

kernel/fs/tarfs.h

@@ -3,6 +3,7 @@
 
 #include <desc.h>
 #include <device/device.h>
+#include <dir_entry.h>
 #include <libk/std.h>
 #include <proc/proc.h>
 #include <proc/reschedule.h>
@@ -40,4 +41,7 @@ int tarfs_describe (struct vfs_volume* volume, const char* path, struct desc* de
 int tarfs_read (struct vfs_volume* volume, const char* path, uint8_t* buffer, size_t off,
                 size_t size);
 
+int tarfs_read_dir_entry (struct vfs_volume* volume, const char* path, struct dir_entry* entry,
+                          size_t entry_num);
+
 #endif // _KERNEL_FS_TARFS_H