Core changes:
- `object.ID` moved to new package `oid`;
- `object.Address` moved to new package `address`;
- `pool.Object` interface changes.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Includes:
- fix for unavailable endpoints of client pool,
- session token cache with request retry in case
of missing session token,
- migrated neofs client.
Signed-off-by: Alex Vanin <alexey@nspcc.ru>
