Function pulsar_sys::pulsar_client_create_producer_async

pub unsafe extern "C" fn pulsar_client_create_producer_async(
    client: *mut pulsar_client_t, 
    topic: *const c_char, 
    conf: *const pulsar_producer_configuration_t, 
    callback: pulsar_create_producer_callback, 
    ctx: *mut c_void
)