node/object: Refactor code making request forwarding

This refactors storage node app making it to use gRPC connection to
remote nodes for request forwarding without wrappers. The behavior is
preserved with some error text added/changed for the better.

Avoid importing `github.com/nspcc-dev/neofs-api-go/v2/rpc` packages. The
only place left will naturally go with coming SDK upgrade. One step
closer to whole `neofs-api-go` module's deprecation.

Signed-off-by: Leonard Lyubich <leonard@morphbits.io>

pkg/services/object/get/v2/util.go

@@ -485,7 +485,7 @@ func (s *Service) toHashRangePrm(req *objectV2.GetRangeHashRequest) (*getsvc.Ran
 			}
 
 			// verify response structure
-			resp2 := new(objectV2.GetRangeResponse)
+			resp2 := new(objectV2.GetRangeHashResponse)
 			if err = resp2.FromGRPCMessage(resp); err != nil {
 				panic(err) // can only fail on wrong type, here it's correct
 			}