FR: Tailscale as Kubernetes CNI

### What are you trying to do?

It would enable use cases like cross-region/cross-cloud Kubernetes clusters, as well as "bursting into cloud" functionality for those running on-prem without worrying about firewalls and VPC peering.

On-prem clusters would also benefit by getting e2e encrypted tunnels between pods and nodes.

I think at the limit, even replacing node<->apiserver communication with Tailscale would be interesting as that would remove some of the complexities involved with PKI management.

[Related discussion on Twitter](https://twitter.com/maisem_ali/status/1533772967481466880?s=20&t=YYhhXFG-FT6bqQtf5GsyVQ)

cc @kris-nova @mauilion

### How should we solve this?

_No response_

### What is the impact of not solving this?

_No response_

### Anything else?

_No response_