Consider using `solana_net_utils::get_public_ip_addr` to find a validator's IPv4

[buffalu]

• ifconfig.me can sometimes return a relayers IP address as IPv6
• The validator uses solana_net_utils::get_public_ip_addr to find the validator's IP address. This runs a TCP connection to an entrypoint on the network and returns a response with the validator's IP.
• This can be leveraged in the relayer instead of using ifconfig.me or other options.