Allow for customisation of NiFiKop Deployment's container securityContext

[ChrisSamo632]

Is your feature request related to a problem?

The securityContext of the container deployed for the NiFiKop operator does not allow for customisation.

Describe the solution you'd like to see

Allow specification of a containerSecurityContext (or other) object in the values.yaml (akin to podSecurityContext), allowing users to provide additional securityContext settings for the NiFi Kop containers, e.g. capabilities.drop

Describe alternatives you've considered

Patching of the NiFiKop Deployment using kubectl patch after deploying the operator with helm install

Additional context

No response