Work is starting on multi-team Airflow, and this project has many
dependencies on a auth manager that can support authn and authz and also
support the changes to the auth manager api (upcoming). An option for
this is Keycloak.

This PR adds a Breeze integartion for Keycloak which creates a container
running keycloak, which uses the existing Postgres container as the DB
and disables the requirements for ssl/https/certificates to use the
Keycloak admin console (since this is only for development purposes not
production).