Select columns explicitly

[kostyazgara]

We need to avoid using select * statement and define all columns explicitly.

Motivation

1. It will not break backward compatibility in the cases when we add new column. So backend will fetch only known columns and integration tests will preserve to work
2. This approach opens an ability to manage columns dynamically via feature flags and allows us to use extend pattern when we need to switch over different columns in real time

Here is an example of framework which is using this approach https://entgo.io/docs/schema-def/