Comments are lost when formatting

We use `format-graphql` along side the `graphql-schema-linter` package (via https://pre-commit.com/)

`graphql-schema-linter` provides the means to disable some of it's lint checks (unused types, camel casing) https://github.com/cjoudrey/graphql-schema-linter#inline-rule-overrides

However, when using it with `format-grahpql` the comments all disappear.

I would have guessed that because comments aren't necessarily part of the GraphQL spec, that any parser from GraphQL might just eat them, and not provide them as AST nodes, but in fact the spec does define comments:

- https://spec.graphql.org/June2018/#sec-Comments