Add possibility to register multiple callbacks to ReverseInterface and TrajectoryPointInterface

[urfeex]

This is an alternative to #358.

It still needs tests, hence the draft status.

[codecov]

Codecov Report

Attention: Patch coverage is 87.17949% with 5 lines in your changes missing coverage. Please review.

Project coverage is 77.55%. Comparing base (289c747) to head (56154c3).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
src/control/trajectory_point_interface.cpp	76.92%	0 Missing and 3 partials ⚠️
src/control/reverse_interface.cpp	50.00%	0 Missing and 1 partial ⚠️
src/ur/instruction_executor.cpp	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #359      +/-   ##
==========================================
- Coverage   78.15%   77.55%   -0.61%     
==========================================
  Files          92       92              
  Lines        4138     4161      +23     
  Branches      456      461       +5     
==========================================
- Hits         3234     3227       -7     
- Misses        674      695      +21     
- Partials      230      239       +9     

Flag	Coverage Δ
start_ursim	81.95% <ø> (-2.06%)	⬇️
ur20-latest	75.61% <87.17%> (-0.07%)	⬇️
ur5-3.14.3	76.11% <87.17%> (-0.17%)	⬇️
ur5e-10.7.0	70.80% <82.75%> (-0.14%)	⬇️
ur5e-5.9.4	76.07% <87.17%> (-0.10%)	⬇️

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[urfeex]

Tests have been added by now, so I will mark this as ready. @mathias31415 as far as I can see, that implementation suits your usecase, right?

[mathias31415]

Tests have been added by now, so I will mark this as ready. @mathias31415 as far as I can see, that implementation suits your usecase, right?

Yes it suits my usecase, thanks a lot!