Add GraphQL API for opendor.me data

[Gummibeer]

Right now there's no public API for opendor.me data - but there could/should be one.

A GraphQL API would be pretty cool and powerful as the user would be able to retrieve whatever they need without having us to adjust the API.

It should be possible to authenticate as an user or organization - so we would need a new table api_keys that has a morph relationship to user or organization model. The API should be read-only for the moment and be limited to the basic and fully public information. It should also only return the data for the authenticated user for the moment but use policies and to limit access so that we could extend it easily.

https://lighthouse-php.com/

https://github.com/rebing/graphql-laravel

https://twitter.com/enunomaduro/status/1429210254827565065
https://github.com/miniaturebase/pest-plugin-graphql