feat: Report shard/pubsubTopic specific connection health/status

[chaitanyaprem]

Problem

As of now peer connection is being reported to status-go based on number of peers connected ir-respective of shards.
Once multiple shards are to be supported either for communities or common ones like for 1:1 chat, the health should be reported separately per shard.

Suggested solution

As per initial discussion, following approach is to be taken:

1. Report relay peer health per shard based from peerManager(as it already tracks relay connections)
2. Report Filter and lightpush health from within status-go as peers are managed by it. This shall later be moved into SDK layer or within go-waku itself.

We can consider 3 states for peerConnHealth:

• Minimally-Healthy
  • Relay Mode: less than 4(D) peers are connected and healthy
  • Light-Mode: 1 filter peer is connected
  • Light-Mode: 1 lightpush peer is available to be connected
• Sufficiently-Healthy
  • Relay Mode: min 4 (D) peers are connected and healthy
  • Light-Mode: min-peers specified for filter are connected
  • Light-Mode: atleast 2 lightpush peers available
• UnHealthy
  • Relay Mode: no peers are connected in relay-mode or connected peers are unhealthy
  • Light-Mode: no filter peers are connected
  • Light-Mode: lightpush peers not available

The following would indicate the peerConnHealth:

• In Relay Mode: go-waku shall notify of this health based on number of peers connected and if scores of connected peers are also healthy . Health of relay peer is determined based on gossipsub score as below:
  • score more than 1000 is considered unhealthy
  • TBD - Need to identify if there are any other aspects to consider such as latency etc.
• In lightMode: status-go shall derive peerConnHealth based on peer connections to Filter and lightpush(This shall be later migrated to SDK layer once Simplify FilterManager status-im/status-go#4665 is complete)

Alternatives considered

None

Additional context

Ref issue status-im/status-go#4628
Need to consider points from #1017 as well while implementing.

Acceptance criteria

Unit tests to verify health reporting