use peers with lowest latencies for protocol selection

[danisharora099]

This is a feature request

Problem

When we select peers to be used for protocols (eg. lightpush), we rely on selecting random peers.
This leads to uncertainties in terms of reliable latencies, while a shorter latency peer might exist.

Proposed Solutions

Use the node with the lowest ping when selecting for a protocol

Notes

• ref: Delay during message sending #1465 (comment)
• is implemented in go-waku

[danisharora099]

closed witih #1540