Verify EC part objects before storage

[cthulhu-rider]

after #3457, objects may be split into EC parts distributed over container. Transmission performs via PUT or REPLICATE RPC. Server can definitely distinguish EC parts. Their format must be checked

Describe the solution you'd like

extend

neofs-node/pkg/core/object/fmt.go

Line 137 in 0a90006

func (v *FormatValidator) Validate(obj *object.Object, unprepared bool) error {

if object is EC part, it must be fully compatible with production func

neofs-node/internal/ec/objects.go

Line 51 in bb155f3

func FormObjectForECPart(signer neofscrypto.Signer, parent object.Object, part []byte, partInfo PartInfo) (object.Object, error) {

otherwise it must be denied