v0.4.0

• [CHANGE] #315 Explicity set start_rpc: false
• [CHANGE] #308 Remove per-DC Reaper templates
• [FEATURE] #293 Add support for encryption
• [FEATURE] #21 Add datacenter to existing cluster
• [FEATURE] #284 Remove datacenter from existing cluster
• [FEATURE] #178 If ClientConfig is modified, automatically restart the k8ssandra-operator
• [ENHANCEMENT] #308 Improve logic to compute Reaper
• [ENHANCEMENT] #342 Expose allowMultipleNodesPerWorker property
  availability mode and remove Reaper DC template
• [BUGFIX] #335 single-up Makefile target does not generate ClientConfig
• [BUGFIX] #285 Fix cluster-scoped kustomizations
• [BUGFIX] #329 Fix cass-operator version
• [DOCS] #357 Set up encryption
• [TESTING] #290 Update DumpClusterInfo method to include more details
• [TESTING] #339 Fix artifact uploads