Use CallbackGroup in PlanningSceneMonitor

[henningkayser]

Similar to #1305, this replaces the private node with a CallbackGroup. There are still some issues with the synced parameters that I need to look into before this is really ready. Also, the CallbackGroup should be applied to the CSM as well.

[codecov]

Codecov Report

Merging #1312 (d6b9ed2) into main (cea5764) will increase coverage by 0.07%.
The diff coverage is 80.40%.

@@            Coverage Diff             @@
##             main    #1312      +/-   ##
==========================================
+ Coverage   61.48%   61.55%   +0.07%     
==========================================
  Files         274      274              
  Lines       24940    24943       +3     
==========================================
+ Hits        15332    15351      +19     
+ Misses       9608     9592      -16     

Impacted Files	Coverage Δ
...it/planning_scene_monitor/planning_scene_monitor.h	28.58% <ø> (ø)
...nning_scene_monitor/src/planning_scene_monitor.cpp	47.98% <80.40%> (+2.26%)	⬆️
...dl_kinematics_plugin/src/kdl_kinematics_plugin.cpp	75.36% <0.00%> (-1.07%)	⬇️

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[henningkayser]

I switched this back to DRAFT because there are still runtime issues with parameter updates I need to look into first.

[mergify]

This pull request is in conflict. Could you fix it @henningkayser?

[tylerjw]

@henningkayser do you have some documentation you can link to I can read to better understand what the issues are here?

Is there some test I can run to see the issues you are experiencing with this change?

[mergify]

This pull request is in conflict. Could you fix it @henningkayser?

[mergify]

This pull request is in conflict. Could you fix it @henningkayser?

[tylerjw]

There is a small conflict but it seems like we abandoned this work. I'll create a issue to track it.