[logstash] Statefulset annotations

[loli71]

Describe the feature:
Currently there is no way to add metadata custom annotations created by statefulsets for logstash helm chart

I will propose in a PR the possibility to customize logstash statefulset annotation through values.yaml.

Describe a specific use case for the feature:
In the DR site deployments, we want to control the deployment of logstash based on a few Deployment annotations. which is not possible now as deployment annotations cannot be passed through values.yaml.