esp_timer: Add an option to skip unhandled events for periodic timers

- Added an option to skip unhandled events for periodic timers. Useful for light sleep.
- Added doc about this case
- Added Test a latency between a call of callback and real event (14-16us). and UT to check skip_unhandled_events.
- Fixed for esp_timer_dump() if name of timer is NULL
- Refactored timer_process_alarm()
- Added the delete function after using in UTs

examples/cxx/experimental/experimental_cpp_component/esp_event_cxx.cpp

@@ -73,7 +73,8 @@ ESPEventRegTimed::ESPEventRegTimed(std::function<void(const ESPEvent &, void*)>
         timer_cb_hook,
         static_cast<void*>(this),
         ESP_TIMER_TASK,
-        "event"
+        "event",
+        false // skip_unhandled_events
     };
 
     esp_err_t res = esp_timer_create(&oneshot_timer_args, &timer);