Add introspection option to @keystone/app-graphql (#43284)
Add introspection option to @keystone/app-graphql (#43284)

Co-authored-by: jonathan-cowling <ed9ab92937dc059d8e66387a17bd777d8cdd7805@users.noreply.github.com>
dsebastien/DefinitelyTyped,dsebastien/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,markogresak/DefinitelyTyped,mcliment/DefinitelyTyped,georgemarshall/DefinitelyTyped