[Raven-L7] DNS manager implementation

[zzguang]

As proposal https://github.com/openyurtio/openyurt/blob/master/docs/proposals/20220930-unifying-cloud-edge-comms.md mentioned: we need to implement the DNS manager in raven-controller-manager for hostname DNS parser.

It mainly includes the tasks below:

1. Create and maintain the map between nodename and IP address, which needs to handle cloud nodes and edge nodes separately, because requests to cloud nodes are inter-domain communication, while requests to edge nodes are cross-domain communication.
2. Record and generate the L7 proxy server Loadbalancer/EIP for L7 proxy agent to connect.

We can leverage most of the YurtTunnel DNS logic to implement it in raven.

[River-sh]

/assign @River_sh