[graphiql] Add "naming conventions" inspections

Naming is always the hardest thing but there are some established conventions for naming in the GraphQL community, see:

* https://benjie.dev/graphql/naming
* https://www.apollographql.com/docs/graphos/schema-design/guides/naming-conventions

Other languages also have their own code style/conventions:

* [Rust](https://doc.rust-lang.org/nightly/style-guide/)
* [Kotlin](https://kotlinlang.org/docs/coding-conventions.html)

Of course everyone is free to have their own preferences but I was thinking it'd be a cool default/guidance for the others. Could there be a setting in GraphiQL for this?

See also https://github.com/graphql/graphql.github.io/issues/2013