Get the current operational and safety state of a robot.
Returns the safety state (armed, disarmed, disarming or error), the
operational state, and the list of currently executing commands. The
operational states a robot can be in are declared in its DSL, so they vary
per robot; idle is always one of them.
Each executing command carries an execution_id that cancel_command
accepts.
The same data is available as the bb://robots/{robot}/state resource.