NeoFS CLI: add node version to neofs-cli netmap nodeinfo output

[anatoly-bogatyrev]

It would be good to add node version to neofs-cli netmap nodeinfo output.
Thanks.

[alexvanin]

1. NodeInfo is an API structure, thus it makes sense to pass API version there. However we can add explicit UserAgent string field.
2. We can pass UserAgent as an X-Header in ResponseMetaHeader of each response.
3. We can return UserAgent in Control API healthcheck, however it is going to be accessible only for allowed clients.

I don't mind (1) or (2).

(1) looks a bit wired because UserAgent field doesn't provide anything meaningful for API and it completely depends on implementation.

(2) requires to have this X-Header in all responses, which is also can be a bit too much.

Thoughts?

[alexvanin]

4. We can set UserAgent attribute in NodeInfo.

[alexvanin]

• Add UserAgent attributes to nodes in neofs-dev-env, e.g. NeoFSNode/0.21.1 or something like that.

[alexvanin]

We can't use / symbol in neofs-node attributes because it used to connect chain of attributes, e.g. Location:Europe/Country:Sweden, etc.
Can we use something like User-Agent:NeoFS-Node-v0.22.3? I know it is not user-agent everyone familiar with, but it's better than nothing.

/cc @realloc @anatoly-bogatyrev

[realloc]

We have just two "special" characters: : and / in attributes definitions. Let's try support escaping them.