feat(helm): add topologySpreadConstraints and PDB

[the-technat]

Hi there

First of all thank you very much for podinfo! It's such a nice app and I used it heavily in the last couple of days to check app availability during migration testing.

Duing so I found myself looking for config options to specify topologySpreadConstraints and podDisruptionBudget in the helm chart which I didn't found. They are often used to ensure maximum availability during upgrades.

So here they are ;)

Tests done: only helm template locally

[the-technat]

Any feedback on this?

[stefanprodan]

@the-technat can you please rebase with upstream master branch and force push so that CI passes. Thanks

[the-technat]

Should be rebased.

[stefanprodan]

LGTM

Thanks @the-technat