Querying contracts by ID/name, server side

[roman-khimov]

Summary or problem description
This is a follow-up to #339, I've overlooked somehow that #340 changed the client, but didn't change the server in any way, while the intention was really to have server answer the requests with ids/names. We want clients to not have any hashes to remember in their code, just point the client to the RPC server and it'll get all the data needed from it.

Do you have any solution you want to propose?
Implement support for #339 on the server side. We have a draft implementation of that in nspcc-dev/neo-go#1426.

Where in the software does this update applies to?

• RPC (HTTP)