The goal of this new component is to be a generic selector for API resources,
unlike the organization/person select, which hardcode various things for their
used resource.

Instead this provides some events which can be used to customize the creation of the
URL for fetching as well as for formatting the list of results.

Atm this only handles the organization and no search-as-you-type like the person select,
but maybe this can be extended in the future.

The newest keycloak library supporst a mode for doing the redirect in an iframe
with a separate page that needs to be whitelisted in keycloak.

The newer version also finally fixes the native promise bugs so we might as well
use the one from npm instead of fetching it from the keycloak server at runtime.