Is your feature request related to a problem? Please describe.

At some ENVs we are deploying 12 Redis pods, and at the initialisations the default behaviour of statefulset is: "OrderedReady" which means that only after that pos-0 will be ready pod-1 will start and it takes too much time for the cluster to be ready

Describe the solution you'd like
I want the ability to change the "podManagementPolicy" to: "Parallel", and then all the leaders pods will be deployed at once, and after they will be ready all the followers will be deployed at once too.

What version of redis-operator are you using?
redis-operator version: 0.19.1