Provide e2e testing based on kuttl

[1995parham]

Provide e2e testing using kuttl. Closes #59

[1995parham]

• Provide NATS helm chart values
• Deploy NACK using its helm chart and connect it to the deployed Jetstream cluster
• Create a stream using NACK and validate the desired state
• Deploy natsbox pod to validate stream creation using natscli

[1995parham]

@wallyqs What do you think about the structure? Right now, it checks stream creation only. If you agree I can create the required Github actions too and then add more cases.

Only issue I need to track down is RBAC. NACK helm chart installs RBAC but they are not removed by helm uninstall so we get error when we run tests multiple times.

[wallyqs]

I think structure looks great, it is easy to follow what is happening in each of the steps.

[1995parham]

I think we can consider this finish for at least checking the stream creation. Here is the workflow result for e2e testing.

https://github.com/1995parham/nack/actions/runs/7170032922/job/19521815874

[wallyqs]

LGTM! 🙌

[wallyqs]

This is awesome, thanks @1995parham!