Publish policy on using generics in gateway-api

[keithmattix]

What would you like to be added:
With generics shipping in go1.18, the gateway-api project needs to have some kind of policy around when and how generics should be used. If upstream Kubernetes has a policy, we likely need to mirror it. If further discussion is needed, please use GitHub Discussions and/or Slack to engage members of the community.

Why this is needed:
Generics are a very new Go feature, and the implications of using them in a large codebase/project are unknown. Thus, it will be useful for contributors to have guidelines for how to use generics in the gateway-api codebase.

/good-first-issue

[k8s-ci-robot]

@keithmattix:
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In response to this:

What would you like to be added:
With generics shipping in go1.18, the gateway-api project needs to have some kind of policy around when and how generics should be used. If upstream Kubernetes has a policy, we likely need to mirror it.

Why this is needed:
Generics are a very new Go feature, and the implications of using them in a large codebase/project are unknown. Thus, it will be useful for contributors to have guidelines for how to use generics in the gateway-api codebase.

/good-first-issue

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[akankshakumari393]

I would like to work on this issue. But would need guidance as well
/assign

[mikemorris]

Refs https://github.com/kubernetes/community/blob/master/sig-architecture/generics.md for the upstream Kubernetes policy, and kubernetes/kubernetes#106846 as a specific attempt at introducing generics in a meaningful way.

FWIW I did previously introduce some trivial usage of generics in #1081

[akankshakumari393]

We have a upstream Kubernetes policy in place for using generics, I think we should mirror it for single source of truth

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[shaneutt]

Where are we at with this?