Provide an API for changing participant profile

[mxgrey]

This PR adds an API to rmf_traffic::schedule::Participant that allows participants to update their profile on the schedule. This allows the profile to be changed in the database without destructing and recreating the Participant object.

[codecov]

Codecov Report

Merging #87 (ac5e5c1) into main (6594a26) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main      #87      +/-   ##
==========================================
- Coverage   23.17%   23.16%   -0.01%     
==========================================
  Files         370      370              
  Lines       30768    30776       +8     
  Branches    14372    14377       +5     
==========================================
  Hits         7129     7129              
- Misses      14134    14174      +40     
+ Partials     9505     9473      -32     

Flag	Coverage Δ
tests	23.03% <0.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
...affic/include/rmf_traffic/schedule/Participant.hpp	0.00% <ø> (ø)
...f_traffic/src/rmf_traffic/schedule/Participant.cpp	50.27% <0.00%> (-2.30%)	⬇️
.../src/rmf_traffic/schedule/internal_Participant.hpp	100.00% <ø> (ø)
rmf_traffic/src/rmf_traffic/agv/Planner.cpp	52.91% <0.00%> (ø)
rmf_traffic/test/unit/agv/test_Negotiator.cpp	10.83% <0.00%> (ø)
rmf_traffic/src/rmf_traffic/DetectConflict.cpp	50.00% <0.00%> (ø)
rmf_traffic/src/rmf_traffic/schedule/Mirror.cpp	41.62% <0.00%> (ø)
rmf_traffic/src/rmf_traffic/schedule/Database.cpp	49.12% <0.00%> (ø)
rmf_traffic/src/rmf_traffic/schedule/Timeline.hpp	46.34% <0.00%> (ø)
rmf_traffic/test/unit/schedule/utils_Database.hpp	17.85% <0.00%> (ø)
... and 25 more