feat: lookup metrics

We need a collect the metric from handshake process to calculate the cost mentioned on "Adaptive Lookup Paper".
We reuse the handshake process to collect these stats since that is a process of message exchange so we can exchange/calculate bandwidth and latency.


ref: https://arxiv.org/pdf/1509.04417.pdf
ref: https://community.f5.com/t5/technical-articles/introducing-tcp-analytics/ta-p/290873