[SPIKE] Investigate Technical Solutions for NGINX Customization

[mpstefan]

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Before pursuing a specific solution like NGINX Template Customization, we want to do a technical spike to investigate what solutions could be employed to allow users to customize NGINX behavior.

At the end of the spike, we want to determine:

1. What solutions can be used to customize which behaviors?
2. How much complexity and time will the solutions cost?
3. What are the implications for security?
4. What are the implications for support, when available?

The results of this investigation should be added to the provisional enhancement proposal for NGINX Customization.

Notes from our meetup on extensibility requirements are available here.

The answers to the above questions should be posted in the discussion here.

[pleshakov]

simple propotype -- https://github.com/pleshakov/nginx-kubernetes-gateway/tree/feature/custom-template

[mpstefan]

Application Delivery Manager and Ingress has template customization that we may use to leverage work in this spike.

[mpstefan]

Take a look at #929 after this spike is complete.

[sjberman]

Closed by #2201