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

Also, remove deprecated method.

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

object/range.go

@@ -0,0 +1,51 @@
+package object
+
+import (
+	"github.com/nspcc-dev/neofs-api-go/v2/object"
+)
+
+// Range represents v2-compatible object payload range.
+type Range object.Range
+
+// NewRangeFromV2 wraps v2 Range message to Range.
+//
+// Nil object.Range converts to nil.
+func NewRangeFromV2(rV2 *object.Range) *Range {
+	return (*Range)(rV2)
+}
+
+// NewRange creates and initializes blank Range.
+//
+// Defaults:
+//  - offset: 0;
+//  - length: 0.
+func NewRange() *Range {
+	return NewRangeFromV2(new(object.Range))
+}
+
+// ToV2 converts Range to v2 Range message.
+//
+// Nil Range converts to nil.
+func (r *Range) ToV2() *object.Range {
+	return (*object.Range)(r)
+}
+
+// GetLength returns payload range size.
+func (r *Range) GetLength() uint64 {
+	return (*object.Range)(r).GetLength()
+}
+
+// SetLength sets payload range size.
+func (r *Range) SetLength(v uint64) {
+	(*object.Range)(r).SetLength(v)
+}
+
+// GetOffset sets payload range offset from start.
+func (r *Range) GetOffset() uint64 {
+	return (*object.Range)(r).GetOffset()
+}
+
+// SetOffset gets payload range offset from start.
+func (r *Range) SetOffset(v uint64) {
+	(*object.Range)(r).SetOffset(v)
+}