Pre parse query modification

### Component

GraphQL Engine

### Is your proposal related to a problem?

I'm developing a data API where users could query data from X days.

Free: last day
Paid: las year
Paid pro: full historical

### Describe the solution you'd like

Ideally, I'd like to apply the filters based on user role, which could be done through model permissions.

But now that I have tried plugins and see the many and great applications that can be applied by modifying the internal data prior to parse.

### Describe alternatives you've considered

I've considered working it out with hasura model permission, but you can't put PostgreSQL literal, like now() - interval '1 year'.

So I went on to try plugins to modify the query on pre parse query,but it's giving errors because 204 doesn't allow modifications.

They also mention it here: https://hasura.io/blog/introducing-plugins-for-hasura-ddn-an-easy-modular-framework-to-customize-your-api