Make split info a status

[cthulhu-rider]

Is your feature request related to a problem? Please describe.

• neofs-api/object/service.proto

  Line 303 in cf4caf5

  SplitInfo split_info = 3;

• neofs-api/object/service.proto

  Line 479 in cf4caf5

  SplitInfo split_info = 3;

• neofs-api/object/service.proto

  Line 678 in cf4caf5

  SplitInfo split_info = 2;

are response body fields. In general, split info is a particular response payload. However, it is mutex with "normal" data - header and/or payload chunks. This makes it more of a response status

in Go SDK, https://pkg.go.dev/github.com/nspcc-dev/neofs-sdk-go/object#SplitInfoError is an error, and they are also kinda status

Describe the solution you'd like

dedicate new status code for split info.

neofs-api/object/types.proto

Line 314 in cf4caf5

message SplitInfo {

itself will be a detail. Deprecate body field. Require servers to respond w/o body depending on the

neofs-api/session/types.proto

Line 164 in cf4caf5

neo.fs.v2.refs.Version version = 1 [json_name = "version"];

field

Describe alternatives you've considered

no more

Additional context

developing new object GET API

[roman-khimov]

It looks to me as something nice to have, but not worth the change at the same time.