feat: node health state

[weboko]

This is a feature request

Problem

Currently there are couple of ways to track reliability of a node:

• getting connections a node has;
• relying on online state;
• checking peers from peerStore;

Proposed Solutions

User propose public API to have unified dev experience.

Notes

Predecessor: #1666
Original discussion: status-im/status-go#4628

[chaitanyaprem]

Not sure if this issue should be part of status-waku integration as this is for js-waku.

cc @chair28980