Kubernetes Ingress Controller

## What is the problem your feature solves, or the need it fulfills?

Is there any future plan to support deploying an ingress controller on Kubernetes that uses Pingora? We have controllers for other services like [Nginx](https://github.com/kubernetes/ingress-nginx), [HAProxy](https://haproxy-ingress.github.io/), and many others.

## Describe the solution you'd like

Create an ingress controller implementation so we have another option when deploying ingress controllers to K8s. This would definitely increase Pingora's adoption by the community.

## Describe alternatives you've considered

None

## Additional context

- https://kubernetes.io/docs/concepts/services-networking/ingress-controllers/