TlsClient
If this client is offering TLS 1.3 or higher, this method may be called to determine for which
            groups a key share should be included in the initial ClientHello.
Return the  TlsPskExternalexternal PSKs to offer in the ClientHello.
Return the session this client wants to resume, if any.
bool IsFallback()
RFC 5077 3.3. NewSessionTicket Handshake Message
Notifies the client of the session_id sent in the ServerHello.
Notifies the client of the session that will be offered in ClientHello for resumption, if any.
            
The protocol implementation validates that any server extensions received correspond to client
            extensions sent.