fix: peer sharing agency is theirs error

[lancevincentsalera]

Issue

• Some peers with peer sharing enabled has this broken behavior of not updating the client states when receiving Message::SharePeers(Vec<PeerAddress>)
• Calling this function from peer sharing client should update the state from State::Busy to State::Idle
• However, upon investigation, it seems like our peer sharing client cannot properly decode the intended message that it should receive.
• Thus, the state won't update and will always be on State::Busy
• Since the current behavior of the fanout stage is to schedule peer discovery up until a number of desired peers
• There will be multiple instances where that peer will try to send_share_request(amount) and recv_peer_addresses() again and again.
• And since the peer sharing client's state of the broken peer is still on State::Busy
• An agency is theirs error will occur because in order for us to do send_share_request(amount) again, we need to be on State::Idle

Fix

• This fix is very reliant on a change in pallas where we expose has_agency() function of Pallas' peersharing mini-protocol client
• We check if we have agency first before we can send_share_request(amount) and recv_peer_addresses() again and again.
• Otherwise, we set the peer's is_peer_sharing_enabled field to false so that it won't try to discover peers again

Other adjustments

• Added a timeout duration for discovered peers when doing handshake query since a long hang will happen if we don't handle it especially with P2P relays
• Another PR will be made for the fix of lock contention issue in the fanout stage