v2/storagegroup: Implement uni-structure

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

v2/storagegroup/types.go

@@ -0,0 +1,71 @@
+package storagegroup
+
+import (
+	"github.com/nspcc-dev/neofs-api-go/v2/refs"
+)
+
+type StorageGroup struct {
+	size uint64
+
+	hash []byte
+
+	exp uint64
+
+	members []*refs.ObjectID
+}
+
+func (s *StorageGroup) GetValidationDataSize() uint64 {
+	if s != nil {
+		return s.size
+	}
+
+	return 0
+}
+
+func (s *StorageGroup) SetValidationDataSize(v uint64) {
+	if s != nil {
+		s.size = v
+	}
+}
+
+func (s *StorageGroup) GetValidationHash() []byte {
+	if s != nil {
+		return s.hash
+	}
+
+	return nil
+}
+
+func (s *StorageGroup) SetValidationHash(v []byte) {
+	if s != nil {
+		s.hash = v
+	}
+}
+
+func (s *StorageGroup) GetExpirationEpoch() uint64 {
+	if s != nil {
+		return s.exp
+	}
+
+	return 0
+}
+
+func (s *StorageGroup) SetExpirationEpoch(v uint64) {
+	if s != nil {
+		s.exp = v
+	}
+}
+
+func (s *StorageGroup) GetMembers() []*refs.ObjectID {
+	if s != nil {
+		return s.members
+	}
+
+	return nil
+}
+
+func (s *StorageGroup) SetMembers(v []*refs.ObjectID) {
+	if s != nil {
+		s.members = v
+	}
+}