Upgrade NeoFS API Go library to version with status returns. Make all API
clients to pull out and return errors from failed statuses. Make signature
service to respond with status if client version supports it.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Define `ControlService` for IR similar to the one from storage node. Add
`HealthStatus` RPC which returns health status of the IR application.
Implement getters, setters and methods to sign/verify the messages.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
