[tcp] add basic CLI-based test (#7336)
[tcp] add basic CLI-based test (#7336)


jwhui/openthread,jwhui/openthread,openthread/openthread,openthread/openthread,srickardti/openthread,abtink/openthread,jwhui/openthread,abtink/openthread,jwhui/openthread,openthread/openthread,srickardti/openthread,srickardti/openthread,srickardti/openthread,abtink/openthread,openthread/openthread,abtink/openthread