toFullSchemaGQLDocument
Returns a "full schema" document containing the built-in definitions supported by Apollo Kotlin.
Using this is usually dangerous as there's a risk of disconnect between the spec version used by the server and the one used by Apollo Kotlin. Whenever possible, it is best to generate a gull schema from introspection results.
See https://github.com/graphql/graphql-wg/blob/main/rfcs/FullSchemas.md