Bootstrap a swh chart only with the cassandra replayer stack

It will allow to test if it's possible to have a global chart
allowing to activate some services via a dedicated flag

List of components:

• deployment of several replayers with their own configuration (topic, replicas, resource requests, ...)
• Node affinity configurable
• Optional statsd exporter deployment
• Autoscaling base on the lag of the kafka consumer

Related to T4391