Add timing monitor for main loop and add monitors to safety flag command

stm-firmware/include/reflow-controller/safety/safety-config.h

@@ -37,12 +37,14 @@ enum safety_flag {
 	ERR_FLAG_WTCHDG_FIRED = (1<<11),
 	ERR_FLAG_UNCAL = (1<<12),
 	ERR_FLAG_DEBUG = (1<<13),
+	ERR_FLAG_TIMING_MAIN_LOOP = (1<<14),
 };
 
 enum timing_monitor {
 	ERR_TIMING_PID = (1<<0),
 	ERR_TIMING_MEAS_ADC = (1<<1),
 	ERR_TIMING_SAFETY_ADC = (1<<2),
+	ERR_TIMING_MAIN_LOOP = (1<<3),
 };
 
 enum analog_value_monitor {