[integration_tests][comm] Extend comm simulator
[integration_tests][comm] Extend comm simulator

Extend comm simulator with with support for transmitter command 0x40:
  * report_uptime

PW-Sat2/PWSat2OBC,PW-Sat2/PWSat2OBC,PW-Sat2/PWSat2OBC,PW-Sat2/PWSat2OBC