Function fn_decrypt_handshake_flight 

pub fn fn_decrypt_handshake_flight(
    flight: &MessageFlight,
    server_hello_transcript: &HandshakeHash,
    server_key_share: &Option<Vec<u8>>,
    psk: &Option<Vec<u8>>,
    group: &NamedGroup,
    client: &bool,
    sequence: &u64,
    client_random: &Random,
    suite: &CipherSuite,
) -> Result<MessageFlight, FnError>

Decrypt encrypted handshake messages from a MessageFlight and return a Flight of decrypted messages.

This functions takes a MessageFlight and search for ApplicationData containing handshake related messages. The decrypted messages are put in an output MessageFlight. If some encrypted messages are coalesced messages, they will be split in different decrypted messages in the resulting MessageFlight