Add objktsByIds query

[iworkinprogress]

Description

This PR adds a query for getting a list of Objkts by id. This works exactly the same as the generativeTokensByIds query.

This functionality is useful for displaying a list of Objkts on a page that are not necessarily related to the same GenerativeToken.

How to Test

Run this query in the GraphQL sandbox:

query {
  objktsByIds(ids: [61387, 61427]) {
    id
    name
    issuer {
      name
    }
  }
}