Start an asynchronous SSL handshake.

template<
    typename HandshakeToken = DEFAULT>
DEDUCED async_handshake(
    handshake_type type,
    HandshakeToken && token = DEFAULT);
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template<
    typename ConstBufferSequence,
    typename BufferedHandshakeToken = DEFAULT>
DEDUCED async_handshake(
    handshake_type type,
    const ConstBufferSequence & buffers,
    BufferedHandshakeToken && token = DEFAULT);
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