support extra annotations on resoures in helm chart

[thesuperzapper]

I would like to be able to set "global" annotations for all resources in the trust-manager helm chart.

The main purpose of this is to allow a single "combined" chart of cert-manager and trust-manager to be applied successfully using Argo CD. Right now, if a combined chart is created, the first sync will always fail (because trust-manager depends on cert-manager being ready).

However, if I could set annotations on all resources, I would be able to make use of Argo CD's Sync Waves to put all the trust-manager resources in a wave that happens after cert-manager.

For example, we might add a value called app.annotations to the chart (which adds no annotations by default), and use it like follows:

app:
  annotations:
    ## assuming cert-manager has a lower wave (or no wave) set
    argocd.argoproj.io/sync-wave: "5"