Consider to feedback for the original repository about support of ESP32

[takasehideki]

#13 tried to add the support of ESP32, not for embeddedRTPS, but also mros2-esp32.
We confirmed the support could be realized by preparing confg_esp32.h and some related code to esp-idf. However, our trial is supposed to use for mros2, and we didn't expect to use it only in embeddedRTPS. But it's somewhat a chance to feedback for the original repository! We will try to support ESP32 only for embeddedRTPS.