[GraphQL] Create graphql analysis tool

Proposal

Our GraphQL endpoint can execute queries, but just as valuable would be an endpoint or rake task that can analyze them

This would:

• verify that the query is syntactically correct and matches our schema
• return the computed complexity, and indicate if it is too complex
• provide any other static checks we care to implement (for example detecting bad arguments, missing arguments when disjoint, etc)

This can be used to improve test coverage by linting all *.graphql files during our pipelines.