commander/safety: replace safety.msg with Safety class (#19558)

msg/CMakeLists.txt

@@ -137,7 +137,6 @@ set(msg_files
 	rc_parameter_map.msg
 	rpm.msg
 	rtl_time_estimate.msg
-	safety.msg
 	satellite_info.msg
 	sensor_accel.msg
 	sensor_accel_fifo.msg

msg/safety.msg

@@ -1,3 +0,0 @@
-uint64 timestamp		# time since system start (microseconds)
-bool safety_switch_available		# Set to true if a safety switch is connected
-bool safety_off			# Set to true if safety is off

msg/vehicle_status.msg

@@ -116,3 +116,6 @@ uint8 latest_disarming_reason
 uint64 armed_time       # Arming timestamp (microseconds)
 
 uint64 takeoff_time     # Takeoff timestamp (microseconds)
+
+bool safety_button_available	# Set to true if a safety button is connected
+bool safety_off					# Set to true if safety is off