mv can converter list to opendbc

[sshane]

commaai/openpilot#34543

For now we'll use (5x slower):

def can_capnp_to_can_list(can_list):
  return [
    (can.logMonoTime, [(msg.address, msg.dat, msg.src) for msg in can.can])
    for can in can_list
  ]