Allow addition of containerPort(s) to nifi via Helm Chart

[kirkxd]

What this PR does / why we need it:

This PR is created because current chart functionality doesn't allow for modification or additions of Container Ports for the nifi pod. With this addition, we can now configure extra ports that can be listened on in order to utilize other functionality of Nifi in Kubernetes. For our use case, we need to actively manage additional ports because of some processors in NiFi where we can choose to listen on certain ports. Issue was that ports cannot be changed or added in Chart values.

Which issue this PR fixes

N/A

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• [X] DCO signed
• [X] Variables are documented in the README.md

[banzo]

Thanks!

[kirkxd]

Thanks!

Awesome, thank you!