ESP32-C2 has a single group timer, thus it will use it for the interrupt watchdog,
which is more critical than the task watchdog. The latter is implement in
software thanks to the `esp_timer`component.
This commit does the following:
- Update existing unit tests that use the TWDT to call the new
esp_task_wdt_init() API
- Add a set of dedicate TWDT unit tests
- Updates the TWDT example