Add API for enabling/disabling Responsive Wait behavior

[mxgrey]

This PR adds an API to toggle the responsive wait behavior on and off. It also adds a parameter to toggle the responsive wait on and off for the legacy fleet adapter. To test this, you can run the office demo from rmf_demos and run the following:

$ ros2 param set /tinyRobot_fleet_adapter enable_responsive_wait false

The idle robots will disappear from the schedule which indicates that they are now completely unresponsive. Setting this parameter back to true will bring them back to the schedule and make them responsive again.

[codecov]

Codecov Report

Merging #209 (c924da4) into main (3be4edf) will increase coverage by 0.09%.
The diff coverage is n/a.

❗ Current head c924da4 differs from pull request most recent head 377acf3. Consider uploading reports for the commit 377acf3 to get more accurate results

@@            Coverage Diff             @@
##             main     #209      +/-   ##
==========================================
+ Coverage   17.61%   17.70%   +0.09%     
==========================================
  Files         209      844     +635     
  Lines       19351    77984   +58633     
  Branches     9297    37416   +28119     
==========================================
+ Hits         3409    13810   +10401     
- Misses      12274    49250   +36976     
- Partials     3668    14924   +11256     

Flag	Coverage Δ
tests	17.70% <ø> (+0.09%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
.../rmf_rxcpp/RxCpp-4.1.0/Rx/v2/src/rxcpp/rx-util.hpp
..._monitor_nodes/delayed_query_broadcast_monitor.cpp
...xCpp-4.1.0/Rx/v2/src/rxcpp/operators/rx-filter.hpp
...s2/src/rmf_traffic_ros2/schedule/convert_Patch.cpp
...Cpp-4.1.0/Rx/v2/src/rxcpp/subjects/rx-behavior.hpp
...ter/src/rmf_fleet_adapter/agv/test/MockAdapter.cpp
.../rmf_fleet_adapter/test/services/test_FindPath.cpp
...clude/rmf_fleet_adapter/agv/RobotCommandHandle.hpp
...fleet_adapter/src/rmf_fleet_adapter/LegacyTask.hpp
..._traffic_ros2/schedule/internal_convert_vector.hpp
... and 1043 more

[youliangtan]

Thanks for this feature, tested it and it works. Thinking of another scenario: A user wishes to update the robot position during idle (robot on the right), so to inform the other active robot (left) to reroute instead of being blocked by the idle robot. Can we have something like a "stubborn wait" behavior? Or users will need to call the be_stubborn() API in their fleet adapter impl.