Require descriptions for GraphQL types, input objects, and enums, enforced with Rubocop

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Problem

GraphQL field, argument, and enum value descriptions are required, and have a defined styleguide. This is enforced with the Graphql/Descriptions cop.

But GraphQL types, input objects, and enums and are not documented as required, do not have a defined description styleguide, or enforced by a cop.

These are the descriptions that are given to these objects with the description method, example.

Proposal

• Require that types, input objects, and enums have descriptions (through description).
• Define a styleguide for the descriptions if it makes sense to.
• Add a Rubocop (or tweak Graphql/Descriptions) to enforce rules