Start an asynchronous SSL handshake.

template<
    typename HandshakeToken = default_completion_token_t<executor_type>>
DEDUCED async_handshake(
    handshake_type type,
    HandshakeToken && token = default_completion_token_t< executor_type >());
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template<
    typename ConstBufferSequence,
    typename BufferedHandshakeToken = default_completion_token_t<executor_type>>
DEDUCED async_handshake(
    handshake_type type,
    const ConstBufferSequence & buffers,
    BufferedHandshakeToken && token = default_completion_token_t< executor_type >(),
    constraint_t< is_const_buffer_sequence< ConstBufferSequence >::value >  = 0);
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