Include GraphQL-types for menu and breadcrumbs in this library

[tajakobsen]

It would be nice if GraphQL-types (based on lib-graphql) for menu and breadcrumbs could be bundled with this library.

#57 needs to be implemented first, so that this library can be used with Headless projects.

[tajakobsen]

I'm using doing this for my Cristin Library, where I have a function has the context and creationCallbacks as arguments.

You can see one of the graphQL types for persons from Cristin here.