Status code for ACL access restrcitction

[alexvanin]

I guess we can have one or two (for basic and extended ACL) status codes that notify about access restriction. It can be used in nspcc-dev/neofs-s3-gw#328 to return correct status code (now it relies on message with access to operation * is denied by sub string).

[KirillovDenis]

It would be nice to have status code for not found container and object errors as well.
I'm not sure if we need separate issue for this.

[alexvanin]

It would be nice to have status code for not found container and object errors as well. I'm not sure if we need separate issue for this.

Better to create new issues in neofs-api repository for that.