Add random pose generator stage (ros2)

[sjahr]

ROS 2 port of #166

[codecov]

Codecov Report

Attention: 75 lines in your changes are missing coverage. Please review.

Comparison is base (b25d2ba) 42.82% compared to head (2ac263e) 42.41%.
Report is 1 commits behind head on ros2.

Additional details and impacted files

@@            Coverage Diff             @@
##             ros2     #497      +/-   ##
==========================================
- Coverage   42.82%   42.41%   -0.40%     
==========================================
  Files          82       83       +1     
  Lines        7967     8043      +76     
==========================================
  Hits         3411     3411              
- Misses       4556     4632      +76     

Files	Coverage Δ
core/src/stages/generate_pose.cpp	0.00% <0.00%> (ø)
core/src/stages/generate_random_pose.cpp	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

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[sea-bass]

I feel like having at least a few tests for this new functionality would be appropriate... besides that, nothing major on my end.

[MarqRazz]

So happy to see this is finally getting added in!