Nonfunctional Baseline Testing

[mpstefan]

The objective of baseline establishment is to understand how changes to the system either improve or negatively impact performance of the system.

In the case of NGINX this relates to both the establishment of sane defaults that help customers have immediate success as well as the impacts of configuration changes (how long they take, how efficient are we at reducing reloading impacts, etc.)

The objective is not measuring the performance of NGINX itself, it is measuring the impacts of the NKG controller system.

Discussion: #752

### Tasks
- [ ] https://github.com/nginxinc/nginx-kubernetes-gateway/issues/950
- [ ] https://github.com/nginxinc/nginx-kubernetes-gateway/issues/951
- [ ] https://github.com/nginxinc/nginx-kubernetes-gateway/issues/952
- [ ] https://github.com/nginxinc/nginx-kubernetes-gateway/issues/953
- [ ] https://github.com/nginxinc/nginx-kubernetes-gateway/issues/954
- [ ] https://github.com/nginxinc/nginx-kubernetes-gateway/issues/955
- [ ] https://github.com/nginxinc/nginx-kubernetes-gateway/issues/956

Questions for Discussion

• Do we absolutely need all of the baseline tests above?
• Do we have an idea of how long each would take?
• Where can we track the results?