Extended search with attributes returned

[roman-khimov]

Is your feature request related to a problem? Please describe.

I'm always frustrated when we can't have something like ORDER BY in our searches. It'd simplify nspcc-dev/neo-go#3496 greatly, but:

• individual node can't sort objects, it doesn't know the criteria
• even if it's to know the criteria we can't merge results from different nodes

Describe the solution you'd like

We can extend search result with attributes if they're requested. It can be different from "ORDER BY", something like "WITH FIELD", but the result would be []{oid, []attributeValue} (ordered by requested attributes) instead of []oid. Then the request originator can do anything it wants with these fields including ordering or choosing the most appropriate version of an object (REST).

Describe alternatives you've considered

Dunno. Currently it's just an idea.

[roman-khimov]

By "FIELD" I mean attribute key, of course.