Connector metric scraping: Add service and servicemonitor objects. Add port to connector to depl…

[qoeveleie21]

This PR is meant to address issue #85.

The PR contains a deployment for a service and a service monitor.

The intended behaviour is that if:

• Metrics are enabled on the pod -> Service deployment is created
• serviceMonitor is enabled -> the serviceMonitor deployment is created if metrics are also enabled in the container

Considerations:

• The service deployment is not created if the metrics are not enabled as there are no other ports to expose, and the service deployment would be 'empty'
• As connectors cannot be specified in the default values I have made the servicemonitor value optional with defaults within the chart.

[ialejandro]

Can you update these files?

• https://github.com/devops-ia/helm-opencti/blob/main/charts/opencti/docs/examples.md: add example how-to activate serviceMonitor
• https://github.com/devops-ia/helm-opencti/blob/main/charts/opencti/ci/ci-common-values.yaml: add serviceMonitor feature to check if pass tests (I'm working on add Prometheus CRDs on CI/CD)