Implement Protobuf support

[gman0]

Upstream added Protobuf codec support in v1.32 k8s release. This a tracker to add that functionality. This work may entail changes in client-go, kcp and kubernetes repos too, with the respective trackers for the partial tasks to be filled in once we start working on this.

Related commit in upstream's code-generator:

kubernetes/code-generator@2ce8296

[cnvergence]

I can take a look at this one :)

[gman0]

Hi @cnvergence , great! Just know that this may be worked on only once kcp-dev/kcp#3209 is done.

[cnvergence]

I see now, then I will wait a bit more :)
Thanks