Add options for affinity/tolerations in install helm chart

[ibot3]

The install helm chart for the operator currently does not offer configuration of pod tolerations and affinities:

https://github.com/CrunchyData/postgres-operator-examples/blob/main/helm/install/templates/manager.yaml

As these are very common Kubernetes concepts, they should be added to the chart.

[Mazorius]

If there is interest, I would like to create a PR to add node selection and tolerances

[dsessler7]

Thank you for your suggestion. We have a story in our backlog to add pod/node affinity configurations to the helm chart.