log sql queries in query-log for mutations and subscriptions

[Bessonov]

The documentation makes explicitly clear, that generated sql for mutations and subscriptions aren't logged. I didn't found any github issue or explanation whether it's intended or just not implemented yet. It would be very nice to have this logs for debugging.

A little bit related issue: https://github.com/hasura/graphql-engine/issues/3445

[asb-realrev]

still missing in V2.x as well: if the concern is around unsupported redaction of sensitive fields, then giving the option to temporarily turn on and off such mutation level logging for some limited period of time would even be a useful functionality for debugging/tuning