Porting EspMon to ZephyrOS on a STM32 Boards (or other boards, with a little work)

I built an entire C++ ecosystem for IoT and embedded, but I've had to teach myself the ropes in branching out beyond the ESP32 and beyond Arduino more generally. Here's my first attempt at bridging the knowledge gap. I've ported my EspMon Arduino/ESP-IDF application to Zephyr RTOS.