feat: expose peer discovery to plugins

[dated]

Summary

This PR exposes an instance of the peer discovery to the plugin system. The instance is created by leveraging the getPeerDiscovery dispatch method from the peer store module in order to not duplicate the instantiation logic.

const peerDiscovery = (await app.$store.dispatch('peer/getPeerDiscovery'))
      .withLatency(300)
      .sortBy('latency')

Permission: PEERS_ALL

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

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