Added SpeedLimitRequest message

[Yadunund]

This PR adds a message to request a fleet adapter to impose or remove speed limits on its lanes.

[codecov]

Codecov Report

Merging #43 (c83b212) into main (c0b929d) will decrease coverage by 0.49%.
The diff coverage is n/a.

❗ Current head c83b212 differs from pull request most recent head be61c00. Consider uploading reports for the commit be61c00 to get more accurate results

@@            Coverage Diff            @@
##            main      #43      +/-   ##
=========================================
- Coverage   5.63%    5.14%   -0.50%     
=========================================
  Files       1417     1426       +9     
  Lines      93913   108080   +14167     
  Branches    9977    10230     +253     
=========================================
+ Hits        5296     5564     +268     
- Misses     84861    98603   +13742     
- Partials    3756     3913     +157     

Flag	Coverage Δ
tests	5.14% <ø> (-0.50%)	⬇️

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Impacted Files	Coverage Δ
...os2/rmf_task_ros2/src/rmf_task_ros2/Dispatcher.cpp	0.92% <0.00%> (ø)
...fleet_adapter/src/rmf_fleet_adapter/estimation.cpp	0.00% <0.00%> (ø)
...fleet_adapter/src/rmf_fleet_adapter/load_param.cpp	0.00% <0.00%> (ø)
...fleet_adapter/src/rmf_fleet_adapter/load_param.hpp	0.00% <0.00%> (ø)
...task_ros2/src/rmf_task_ros2/bidding/Auctioneer.cpp	49.03% <0.00%> (ø)
...leet_adapter/src/rmf_fleet_adapter/TaskManager.cpp	12.31% <0.00%> (ø)
...leet_adapter/src/rmf_fleet_adapter/agv/Adapter.cpp	0.00% <0.00%> (ø)
...raffic_ros2/src/rmf_traffic_ros2/blockade/Node.cpp	0.00% <0.00%> (ø)
...raffic_ros2/src/rmf_traffic_ros2/schedule/Node.cpp	0.00% <0.00%> (ø)
...ffic_ros2/src/rmf_traffic_ros2/schedule/Writer.cpp	0.00% <0.00%> (ø)
... and 302 more