Different nodeSelector, affinity and tolerations for core and readReplica

[abronin]

It would be wonderful to have an ability to set different values for nodeSelector, affinity and tolerations for core pods and readReplica pods. This should be a common requirement to run cores and read replicas on a different nodes. NodeSelector and Tolerations are the ways to achieve this.

I would also appreciate any idea on how to achieve this with the existing helm chart.