HorizontalPodAutoscaler Support

[mpstefan]

As a cluster operator using NGF
I want NGF to work with a HorizontalPodAutoscaler
So that I can automate the scaling of my data planes to save on resources and scale up when traffic increases.

NIC PR: nginx/kubernetes-ingress#3276

Acceptance

• (Needs refinement) The user can setup a HorizontalPodAutoscaler for an NGINX deployment and it will work with the NGF control plane.

[mpstefan]

Original discussion issue: #3440

@nowjean Moved your original question to be tracked in this issue. Thanks for the feedback!