[#371] Support recent changes in NeoFS API protocol

Support:
  * new status codes (object, container, session);
  * object `Lock` message;
  * different signature schemes.

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

session/status.go

@@ -0,0 +1,31 @@
+package session
+
+import (
+	"github.com/nspcc-dev/neofs-api-go/v2/status"
+	statusgrpc "github.com/nspcc-dev/neofs-api-go/v2/status/grpc"
+)
+
+// LocalizeFailStatus checks if passed global status.Code is related to session failure and:
+//   then localizes the code and returns true,
+//   else leaves the code unchanged and returns false.
+//
+// Arg must not be nil.
+func LocalizeFailStatus(c *status.Code) bool {
+	return status.LocalizeIfInSection(c, uint32(statusgrpc.Section_SECTION_SESSION))
+}
+
+// GlobalizeFail globalizes local code of session failure.
+//
+// Arg must not be nil.
+func GlobalizeFail(c *status.Code) {
+	c.GlobalizeSection(uint32(statusgrpc.Section_SECTION_SESSION))
+}
+
+const (
+	// StatusTokenNotFound is a local status.Code value for
+	// TOKEN_NOT_FOUND session failure.
+	StatusTokenNotFound status.Code = iota
+	// StatusTokenExpired is a local status.Code value for
+	// TOKEN_EXPIRED session failure.
+	StatusTokenExpired
+)