Add Inner Ring code

pkg/morph/client/netmap/wrapper/irlist.go

@@ -0,0 +1,21 @@
+package wrapper
+
+import (
+	contract "github.com/nspcc-dev/neofs-node/pkg/morph/client/netmap"
+	"github.com/pkg/errors"
+)
+
+// InnerRingKeys receives public key list of inner
+// ring nodes through Netmap contract call and returns it.
+func (w *Wrapper) InnerRingKeys() ([][]byte, error) {
+	// prepare invocation arguments
+	args := contract.InnerRingListArgs{}
+
+	// invoke smart contract call
+	values, err := w.client.InnerRingList(args)
+	if err != nil {
+		return nil, errors.Wrap(err, "could not invoke smart contract")
+	}
+
+	return values.KeyList(), nil
+}