Add topologySpreadConstraints to metabase chart

[arthurk]

This adds the possibility to add topologySpreadConstraints to the metabase chart.

example usage in values.yaml:

topologySpreadConstraints:
  - labelSelector:
      matchLabels:
        app.kubernetes.io/name: xxx
    topologyKey: topology.kubernetes.io/zone
    maxSkew: 1
    whenUnsatisfiable: ScheduleAnyway

[pmint93]

@arthurk thanks your contributing, please bump the chart version also

[arthurk]

@pmint93 done