Implement generic pose randomizer

[henningkayser]

This extension of GeneratePose allows setting random distribution samplers for each pose dimension (x,y,z,roll,pitch.yaw). Currently, only std::uniform_real_distribution and std::normal_distribution are supported. I wasn't sure if this should maybe go into a separate stage, but the name GeneratePose already implies something like pose sampling IMO.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 72 lines in your changes are missing coverage. Please review.

Project coverage is 58.61%. Comparing base (a905572) to head (40e47f1). Report is 12 commits behind head on master.

Files	Patch %	Lines
core/src/stages/generate_random_pose.cpp	0.00%	72 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #166      +/-   ##
==========================================
- Coverage   59.00%   58.61%   -0.39%     
==========================================
  Files          90       91       +1     
  Lines        8485     8578      +93     
==========================================
+ Hits         5006     5027      +21     
- Misses       3479     3551      +72     

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[JafarAbdi]

@v4hn @rhaschke What's blocking this PR .? I'm working on finalizing it this week

[JafarAbdi]

@rhaschke @v4hn Friendly ping. I would like to have this in the next ROS1/ROS2 sync, I've been using this feature for multiple projects for a while without any problem!