Add annotations to operator deployment

[kanor1306]

Hi!

This PR adds annotations configuration for the operator Deployment resource.

Main use case is that when using an externally rotating secret (i.e. Managed secrets in AWS RDS that rotate every 7 days) there is the need to make the operator read the new secret. For this I use the Reloader, which requires you to annotate the deployment with the secret that it should be monitoring to decide if the deployment needs to be restarted.

I have followed the same pattern as podAnnotations for consistentcy.

I am not bumping any version, but let me know if I should bump the chart version or it is something that you do when releasing.

Thanks for all the good work in this operator!

[Demmyart]

+1 request for merging this