Verify storage policy in proto/binary/JSON decoders

[cthulhu-rider]

See checks in

neofs-sdk-go/netmap/node_info.go

Line 37 in 05e793c

func (x *NodeInfo) fromProtoMessage(m *protonetmap.NodeInfo, checkFieldPresence bool) error {

. I'd expect the same thing here, so Verify() can be called right in the PlacementPolicy.fromProtoMessage

Originally posted by @roman-khimov in #736 (comment)

[cthulhu-rider]

see also #638

[cthulhu-rider]

also, behavior should be the same for all types across the lib

[roman-khimov]

My point is that there are proto/* things for "strange" structures, one can decode into these basic structs and go. While upper-lever netmap/object/etc types should be designed for safer use, like when you unmarshal them from any source you don't get something that's broken by definition.