Handle columns named `node_id`

[eddiew]

Summary

Adding a column named node_id to any table causes postgraphile to emit an error like this, and prevents schema generation:

Error occurred during watch schema generation: Error: Expected an output type named 'ExecutionStep', but that type was not successfully constructed; typically this is because it ended up with no fields.

I assume that there isn't a way to have it work with columns named node_id, since this is part of global object identification spec.

Steps to reproduce

Create a column named node_id

Expected results

Postgraphile should probably show a more helpful error message.

Actual results

See above

Additional context

N/A

Possible Solution