Job template should support custom annotations

**Is your feature request related to a problem? Please describe.**
I deploy the couchdb helm chart as a subchart/dependency with `autoSetup.enabled: true` to a cluster that includes Istio. The Istio sidecar does not exit/complete when the auto setup Job's `cluster-setup` container exits, so the Job does not complete or succeed.

**Describe the solution you'd like**
I would like the ability to add custom annotations to the auto setup Job. These would need to be different annotations than those applied to the StatefulSet.

**Describe alternatives you've considered**
In the short term, I have duplicated the Job template and updated it to include a custom annotation that disables the Istio sidecar for the job.

**Additional context**
I would be willing to contribute a pull request if it would be considered.