Add query / enums scaffolding

I.e. auto-generate:

```
extend type Query {
costTypes: [CostTypeDetail!]!
}
```

And

```
import { CostTypes } from "src/entities";
import { QueryResolvers } from "src/generated/graphql-types";

export const costTypes: Pick = {
async costTypes() {
return [...CostTypes.getValues()];
},
};
```

Using the history file approach to do it "only once" so that the dev can delete it if they want.

Questions:

* Should `extend type Query { costTypes }` go in its own `costTypes.graphql` or our existing `enums.graphql` which is admittedly pretty large at this point?