Implement controller to assign IP manually for pod

[mraerino]

This can be useful when other means of routing the traffic to a pod than a load balancer are used.

E.g. you could be using the ipvlan CNI plugin with Multus.

Example setup

```yaml apiVersion: apps/v1 kind: DaemonSet metadata: name: coturn namespace: turn spec: selector: matchLabels: app: turn template: metadata: labels: app: turn hcloud-ip-floater.cstl.dev/floating-ip: "78.47.226.156" annotations: k8s.v1.cni.cncf.io/networks: | [ { "name": "relay-net", "ips": ["78.47.226.156/32"] } ] spec: # ... --- apiVersion: k8s.cni.cncf.io/v1 kind: NetworkAttachmentDefinition metadata: name: relay-net namespace: turn spec: config: | { "cniVersion": "0.3.1", "type": "ipvlan", "master": "eth0", "mode": "l2", "ipam": { "type": "static" } } ```