Create k8s database operators

mysql operator
redis operator
mongodb operator
kafka operator

everything configurable high available.
each instance configurable with authentication, replication constraints, spread taints.

mysql: replica counts, spread taints over worker location labels, master-slave and multi-master setup, persistant storage as volume

mongodb: sharding and replica count settings, persistant storage as volume

redis: persistant storage as volume, replica counts

kafka: also high availible setup, configurable data retention, persistant storage as volume

elastic-search: high available setup, persistent storage