[CM] Set default strictness of switch_controllers using parameters

[saikishor]

As the title suggests, the idea is to be able to use the set the default behavior of the strictness of the switch_controllers service

[christophfroehlich]

The idea is reasonable, LGTM. Just one minor thing: release notes pls ;)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.13%. Comparing base (7d81236) to head (84c631a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2168   +/-   ##
=======================================
  Coverage   89.12%   89.13%           
=======================================
  Files         139      139           
  Lines       16117    16122    +5     
  Branches     1389     1388    -1     
=======================================
+ Hits        14364    14370    +6     
+ Misses       1224     1223    -1     
  Partials      529      529           

Flag	Coverage Δ
unittests	89.13% <100.00%> (+<0.01%)	⬆️

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

Files with missing lines	Coverage Δ
.../controller_manager/controller_manager_services.py	82.53% <100.00%> (+0.98%)	⬆️
controller_manager/controller_manager/spawner.py	74.82% <100.00%> (+0.36%)	⬆️
controller_manager/controller_manager/unspawner.py	70.73% <100.00%> (+1.50%)	⬆️
controller_manager/src/controller_manager.cpp	76.25% <100.00%> (-0.02%)	⬇️

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[christophfroehlich]

Thx ;)