Ext4Pkg: Add inode number validity check

We need to validate inode number to prevent reading non-existent and
incorrect inodes so we checks that inode number valid across opened
partition before we read it in Ext4ReadInode.

Cc: Marvin Häuser <mhaeuser@posteo.de>
Cc: Pedro Falcato <pedro.falcato@gmail.com>
Cc: Vitaly Cheptsov <vit9696@protonmail.com>
Fixes: d9ceedca ("Ext4Pkg: Add Ext4Dxe driver.")
Signed-off-by: Savva Mitrofanov <savvamtr@gmail.com>
Acked-by: Marvin Häuser <mhaeuser@posteo.de>