[#64] object: move package from neofs-api-go

Also, remove deprecated method.

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

object/type.go

@@ -0,0 +1,61 @@
+package object
+
+import (
+	"github.com/nspcc-dev/neofs-api-go/v2/object"
+)
+
+type Type uint8
+
+const (
+	TypeRegular Type = iota
+	TypeTombstone
+	TypeStorageGroup
+)
+
+func (t Type) ToV2() object.Type {
+	switch t {
+	case TypeTombstone:
+		return object.TypeTombstone
+	case TypeStorageGroup:
+		return object.TypeStorageGroup
+	default:
+		return object.TypeRegular
+	}
+}
+
+func TypeFromV2(t object.Type) Type {
+	switch t {
+	case object.TypeTombstone:
+		return TypeTombstone
+	case object.TypeStorageGroup:
+		return TypeStorageGroup
+	default:
+		return TypeRegular
+	}
+}
+
+// String returns string representation of Type.
+//
+// String mapping:
+//  * TypeTombstone: TOMBSTONE;
+//  * TypeStorageGroup: STORAGE_GROUP;
+//  * TypeRegular, default: REGULAR.
+func (t Type) String() string {
+	return t.ToV2().String()
+}
+
+// FromString parses Type from a string representation.
+// It is a reverse action to String().
+//
+// Returns true if s was parsed successfully.
+func (t *Type) FromString(s string) bool {
+	var g object.Type
+
+	ok := g.FromString(s)
+
+	if ok {
+		*t = TypeFromV2(g)
+	}
+
+	return ok
+}