relay: Add Go runtime metrics and process metrics
relay: Add Go runtime metrics and process metrics

Currently the agent has a GoCollector and ProcessCollector but relay
does not, this updates the relay for consistency and enhanced
debuggability.

Signed-off-by: Chance Zibolski <0671e890c734ee0cb7f0027fb3ef2496c29582eb@gmail.com>

cilium/cilium,cilium/cilium,cilium/cilium,cilium/cilium,cilium/cilium