[epic] Move project to Kubernetes-SIGs

[kvaps]

Hey everyone,

We've established a community effort to develop a unified etcd-operator. This project is entirely community-driven and currently comprises mainly members of the Russian-speaking Kubernetes community. Although we've just begun, there's already significant activity, with approximately 10 active developers onboard.

We want two things:

1. To donate this project to CNCF:
   • [Sandbox] etcd-operator cncf/sandbox#91
2. Get a place under kubernetes-sigs:
   • Add etcd-operator subproject to etcd-io kubernetes/community#7796
   • Add maintainers-etcd-operator to etcd-io org kubernetes/org#4839

Let's collect feedback from potencial adopters:

• Cozystack (We are!)
• Cilium CFP: etcd-operator adoption cilium/cilium#31858
• Mayastor etcd-operator adoption openebs/mayastor#1630
• Vitastor etcd-operator adoption vitalif/vitastor#62
• Kamaji etcd-operator adoption clastix/kamaji#431
• Stolon etcd-operator adoption sorintlab/stolon#920
• Patroni
• Goteleport etcd-operator adoption gravitational/teleport#40344
• LINSTOR etcd-operator adoption piraeusdatastore/piraeus-operator#643
• HyperShift etcd-operator adoption openshift/hypershift#3852

And infrom previous etcd-operator's developers:

• coreos/etcd-operator
• bitnami/etcd
• gardener/etcd-druid
• clastix/kamaji-etcd
• aenix-io/kubernetes-in-kubernetes
• improbable-eng/etcd-cluster-operator
• elemir/etcdops
• openshift/cluster-etcd-operator
• warmchang/etcd-operator