Implement first version of the comparison via GQL

600 RUB reward can be claimed by anyone who completes this task.

PostgreSQL + Hasura should be compared with Doublets + Gql.

https://github.com/linksplatform/Comparisons.SQLiteVSDoublets can be used as an example.

https://github.com/linksplatform/Data.Doublets.Gql as a Doublets side.

https://github.com/hasura/graphql-bench/issues/52 should be solved in order to complete this task.