Neo node can return integers values where []byte is expected.
To cover such cases, try to parse integers in `BytesFromStackItem`.
Signed-off-by: Alex Vanin <alexey@nspcc.ru>
Neo-go does not use smartcontract.Parameter to return values
anymore, so it's convertes partly removed from neofs-node.
Signed-off-by: Alex Vanin <alexey@nspcc.ru>