Extract node public key from TLS communication

[fboucquez]

Instead of asking Rest or the Server API for a node' public key, we can use the tls connection to extract the public key.

Example:

openssl s_client -connect 304x.c.time4vps.cloud:7900 | openssl x509 -pubkey -noout

The SDK could provide a node service that given a hostname and a port, it returns the public key hex from the connection (using node's tls module or similar).