Add the monitoring system related messages
The goal is to provide messages used by the monitoring system mentioned in Autoware issue #821.
The following messages are included in this MR:
- AutowareState
- DrivingCapability
- EmergencyState
- Engage
- HazardStatus
- HazardStatusStamped
The monitoring system consists of the following components:
- Autoware State Monitor (system/autoware_state_monitor)
- Autoware Error Monitor (system/autoware_error_monitor)
- Emergency Handler (system/emergency_handler)
The architecture is shown in the below diagram (more details in issue #821).
Edited by Michał Drwięga