Adding lighthouse/peers methods in BeaconNodeHttpClient

[leruaa]

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Issue Addressed

Issue #3041

Proposed Changes

• Add the corresponding get_lighthouse_peers() and get_lighthouse_connected_peers() methods to BeaconNodeHttpClient
• Impl Deserialize on Peer struct and all fields structs recursively

[CLAassistant]

All committers have signed the CLA.

[leruaa]

I noticed that the score is not serialized as:

"score": {
  "score": 0
}

like described in the book, but like that:

"score": {
  "RealScore": {
    "lighthouse_score": 0,
    "gossipsub_score": 0,
    "ignore_negative_gossipsub_score": false,
    "score": 0
  }
}

Do we want to keep all the score details? Maybe we could streamline to just:

"score": 0

But obviously, that another breaking change...

[dapplion]

Superseded by

• https://github.com/sigp/lighthouse/pull/4937