feat: find peer when there are no maddrs

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What's in this PR

• This aims to increase the providers that the check will actually check (and reduce the results with no addresses)
• Explicitly look up peer maddrs with DHT FindPeer call when none are returned from the FindProviders call

Why?

• Peer maddrs will only be kept around for 15 minutes after a successful connection
• DHT Servers will keep the peer maddrs for 24 hours when handling ADD_PROVIDER. Note that this is only true since Kubo 0.20 (depending on go-libp2p-kad-dht 0.22 with this PR) and that 30% of the network is still running Kubo versions lower than 0.20)
• Provider record expiration is 48 hours, so when there are no peer addrs, it's either because the peer went offline or maybe it just hasn't advertised again for it's maddrs to be cached. This PR account helps for this latter case, where the peer hasn't advertised again (for whatever reasons).

Anecdotally, this case is pretty common (providers without maddrs that can be resolved independently with FindPeer)