fix(helm): add nodeSelector, affinity and topologySpreadConstraint to Helm Chart

[hajowieland]

Fixes #475

Added the following config in Deployment template and to Chart default values.yaml:

• affinity
• nodeSelector
• topologySpreadConstraint

And updated the version in the Chart.yaml and in the raw manifest files.

[akorp]

Seems like there is already one tolerations in helm https://github.com/slok/sloth/pull/319 (upd: which also seems to be on a slightly wrong level - on container level, while probably should be on the pod level).