cli: add utility to run gql queries from the command line

Novem has a pretty rich gql API, but it's a bit painful to play around with as it requires either POST requests or fairly complex GET requests.

I suggest we add an optional param to the --gql syntax using the @filename syntax

So you can do `novem --gql @query.txt` to run the gql query stored in `query.txt`

The output should be printed to stdout and the user can pipe if they need to